Willis PAO Mnemonic Library
A comprehensive mnemonic system called PAO (Person/Action/Object) for remembering pairs of digits from 00-99 is described in Moonwalking with Einstein: The Art and Science of Remembering Everything by Joshua Foer. His blog is at http://joshuafoer.com.
Check out a related blog by Josh Cohen at http://Mnemotechnics.org.

See also the Wikipedia references for the Mnemonic Major System and the Method of Loci.
The program 
 2Know (free download) was used to generate a long list of candidate objects for each number pair.  See more notes below. The 100 images for this library can be viewed individually from the tables below or they can be played in a slideshow sequence with captions at Picasaweb (hint: press F11 for full screen view). 

Collage of 100 PAO images updated 7/20/2011


 Photo Credits: Images for each Person are linked in the Person columns below. The Internet source for these images is  
  linked in the ## column.  Last updated: 02/03/2012, Willis Jarvis  jwleaf.org
02/03/12: Changed #14 Fertilize to Plant 
11/21/11: Changed  #24 Barbeque to Barbecue, #81 Walk over to Walk on, #86 Hook to Surf)  
## Person - Action - Object## Person - Action - Object
0   The Snow Queen              Freeze               ice
1   Huck Finn                         Stub                   toe
2   Godson Juan Antonio    Splash                honey
3   Hansel & Gretel                Taste                  home
4   Siddhartha                        Pull out                arrow
5   The Buddha                      Illuminate            halo
6    Bodhidharma                   Gaze                    shoe
7    Houdini                            Hide                   key
8    Jack Beanstalk                 Climb                  ivy
9    Judy Garland                    Sing                    rainbow
10  Samurai                              Shake                dice
11  Queequeg                         Hurl                    tattoo
12  Francis Assisi                  Pet                      twine
13  Little Jack Horner             Insert                 thumb
14  Johnny Appleseed          Plant                  tree
15  Talu  Gibbon                    Tease                 tail
16  Jim Empire Sun                 Hide                   ditch
17  Thoreau                             Back off            duck
18  Mandelbrot                      Zoom in              tofu
19  Geronimo                          Point                   tepee
20  Brachiosaurus                 Sneeze                nose
21  The Nutcracker               Crack                   nut
22  Job                                    Weep                  onion
23  Dory                                  Swim                  Nemo
24  Hamlet                              Barbecue            wiener
25  Noah                                 Hammer               nail
26  Seaman Dana                  Hoist                  wench
27  E.T.                                    Stretch               neck
28  Edwin Hubble                  Expand              nova
29  Derren Brown                   Twist                 knob
30  Jean Baptiste                    Flip                     moose
31  Thor Heyerdahl               Float                   moat
32  Galileo                               Squint                 moon
33  King Tut                           Wrap                 mummy
34  Gollum                              Bite                      moray
35  Bhaddali                           Swallow               mule
36  Little Match Girl              Scratch               match
37  Robinson Crusoe            Shade/Cover     macaw  
38  Kitchen Stories               Drink                   movie
39  Oscar Pistorius                Bounce              amoeba
40  Mahatma Gandhi             Spin                   rice
41  Linnaeus                          Varnish               root
42  Tarzan                              Swing                rhino
43  Brother Paul                    Kneel                 room
44  Masai                               Jump                 warrior
45  John Henry                     Explode             railway
46  Tarahumara                     Jog                   huarache
47  Abraham Lincoln           Cement             rock
48  Milarepa                          Listen               roof
49  Statue of Liberty            Fold                  robe
50  The Lone Ranger          Corral                   lasso
51  Marie Curie                    Photograph          light
52  Ashoka                           Roll                       lion
53  Mary Schoolgirl            Follow                   lamb
54  Segovia                          Strum                     lyre
55  Euclid                             Flatten                    lily
56  Stand by Me                 Peel                         leech
57  Neanderthal                 Wrestle                    lake
58  Robert Frost                 Subside                  leaf
59  Godson Daniel             Dance                     lip
60  Magnus Carlsen          Play                        chess
61  Achilles                         Sprint                     cheetah
62  Jacob Marley                Drag                      chain
63  Tinker Bell                     Scatter                  chime
64  Miss Muffet                  Sit                          chair
65  Venus                             Stand on              shell
66  Alan Turing                  Count                    hashish
67  Bill Gates                        Autograph          check
68  Tolstoy                           Cut                       sheaf
69  Ulysses                           Sail                       ship
70  Aesop                             Squeeze               goose
71  Benjamin Franklin          Fly                         kite
72  Lewis & Clark                 Paddle                  canoe
73  Swami Sivananda          Toss                      comb
74  Audubon                       Sketch                   crow
75  Paul Revere                    Blow                     quail
76  Suchi                               Curl                       cashew
77  Heifetz                             Fiddle                   cuckoo
78  Sleeping Beauty            Wake up               coffee
79  Picasso                           Color                      cube
80  Ramana Maharshi        Go around             face
81  John Muir                      Walk on                foot
82  Stevie Wonder              Call                        phone
83  Godson Fabian              Laugh                   foam
84  STS-125 Atlantis           Burn                      fire
85  Thomas Edison             Sharpen                 file
86  The Old Man & Sea      Surf                       fish
87  Carl Sandburg               Tiptoe                    fog
88  Yankee Doodle              March                   fife
89  Walkabout                      Clip on                 fob
90  The Carpenters              Ride                      bus
91  Peer Gynt                        Lie on                   bed
92  Charles Darwin              Dig up                  bone
93  Samuel Coleridge           Dream                 opium
94  Godson Jesus                 Polish                  boar
95  Newton                            Push                    apple
96  Craig Venter                    Clone                  peach
97  Gandalf                            Stop                    book
98  Ferdinand                       Smell                   beef
99  White Fang                    Howl                   puppy

Same data one image per row:
## Person  Action (rationale) Object ##
0 The Snow Queen Freeze  (Kay kidnapped to the Queen's Ice Palace) ice 0
1 Huck Finn Stub (bare toe) toe 1
2 Godson Juan Antonio Splash (favorite swimming hole El Pozo Bonito) honey 2
3 Hansel & Gretel Taste (gingerbread house) home 3
4 Siddhartha Pull out (arrow from swan shot by Devadatta) arrow 4
5 The Buddha Illuminate halo 5
6 Bodhidharma Gaze (at wall 9 years.  Carried one shoe while walking home) shoe 6
7 Houdini Hide key 7
8 Jack Beanstalk Climb ivy 8
9 Judy Garland Sing rainbow 9
10 The Seventh Samurai Shake dice 10
11 Queequeg Hurl (harpoon from Moby Dick Pequod)  
tattoo 11
12
Francis Assisi
Pet (wore rope belt, having compassion for animals) twine 12
13 Little Jack Horner Insert   thumb 13
14 Johnny Appleseed Plant  tree 14
15 Talu Gibbon Tickle tail 15
16 Jim Empire of the Sun Crawl (Jim taking cover)
ditch 16
17 Thoreau Back off  (retreat to Waldon Pond) duck 17
18 Mandelbrot Zoom in  (fractal landscape) tofu 18
19 Geronimo Point tepee 19
20 Brachiosaurus Sneeze (Jurassic Park scene) nose 20
21 The Nutcracker Crack  nut 21
22 Job Weep  onion 22
23 Dory  Swim ("Just keep swimming ...") Nemo 23
24 Hamlet Barbecue ("Be", or Oscar Meyer "not to be...") wiener 24
25 Noah  Hammer nail 25
26 Seaman Dana Hoist  (while Two Years Before the Mast) wench 26
27 E.T. Stretch  (telescoping neck) neck 27
28 Edwin Hubble Expand (universe) nova 28
29 Derren Brown Twist knob  29
30 Jean Baptiste Flip  moose 30
31 Thor Heyerdahl Float moat 31
32 Galileo Squint (single eye telescope) moon 32
33 King Tut Wrap  mummy 33
34 Gollum Bite   moray   34
35 Bhaddali Swallow (stubbornly ignored rules about eating) mule 35
36 Little Match Girl Scratch match 36
37 Crusoe Shade or Cover (but not Hide #07)   macaw 37
38 Kitchen Stories Drink (Isaac's birthday party) movie 38
39 Oscar Pistorius Bounce (legs on springy blades) amoeba 39
40 Gandhi
Spin  (homespun khadi)
rice 40
41 Linnaeus Varnish root 41
42 Tarzan Swing  rhino 42
43 Brother Paul Kneel room 43
44 Masai Warrior Jump   warrior 44
45 John Henry Explode rail 45
46 Tarahumara Jog (Copper Canyons of Chihuahua) huarache 46
47 Abraham Lincoln Cement  rock 47
48 Milarepa Listen (in Tibet, the roof of the world) roof 48
49 Statue of Liberty Fold  robe 49
50 The Lone Ranger Corral lasso 50
51 Marie Curie Photograph light 51
52 Ashoka Roll (the wheel of dhamma) lion 52
53 Mary Schoolgirl Follow   lamb 53
54 Segovia Strum lyre 54
55 Euclid Flatten (plane geometry) lily 55
56 Stand by Me Peel   leech 56
57 Neanderthal   Wrestle (in remote glacial cirques) lake 57
58 Robert Frost Subside (from poem nothing gold can stay) leaf 58
59 Godson Daniel Dance  lip 59
60 Magnus Carlsen Play   chess 60
61 Achilles   Sprint cheetah 61
62 Jacob Marley Drag   chain 62
63 Tinker Bell   Scatter chime 63
64 Miss Muffet Sit on  chair 64
65 Botticelli Venus Stand on   shell 65
66 Alan Turing Count hashish 66
67 Bill Gates Autograph check 67
68 Leo Tolstoy Cut sheaf 68
69 Ulysses Sail ship 69
70 Aesop Squeeze (a golden egg) goose 70
71 Ben Franklin Fly kite 71
72 Lewis & Clark Paddle   canoe 72
73 Swami Sivananda Toss (drop attachment like a comb out the window) comb 73
74 Audubon Sketch  (with a black crow feather) crow 74
75 Paul Revere Blow (horn, the British are coming) quail 75
76 Suchi Curl  (little dog curls up like a cashew) cashew 76
77 Heifetz Fiddle (cuckoo pops out and in like a violin bow) cuckoo 77
78 Sleeping Beauty Wake  up (smell the coffee) coffee 78
79 Picasso Color (cubism) cube 79
80 Ramana Maharshi Go around (circumambulate Arunachala hill) face 80
81 John Muir Walk on (over or across the Sierra Nevada) foot 81
82 Stevie Wonder  Call (to say I love you) phone 82
83 Godson Fabian Laugh foam 83
84 STS-125 Atlantis   Burn   fire 84
85 Edison Sharpen file 85
86 Old Man &  Sea Surf  fish 86
87 Carl Sandburg Tiptoe (fog comes on little cat feet) fog 87
88 Yankee Doodle   March   fife 88
89 Walkabout Clip on (waist trinkets) fob 89
90 The Carpenters Ride (Ticket to Ride) bus 90
91 Peer Gynt Lie on bed 91
92 Charles Darwin Dig up (ancient fossils) bone 92
93 Coleridge Dream opium 93
94 Godson Jesus Polish (a boar-tooth necklace) boar   94
95 Newton Push (force of gravitation accelerating apple) apple 95
96 Craig Venter Clone (fuzzy peach bloom of bearded face) peach 96
97 Gandalf Stop (the Balrog shall not pass) book 97
98 Ferdinand Bull Smell (flowers) beef 98
99 White Fang Howl puppy 99

Notes:
In PAO, all 100 pairs of digits from 00 to 99 are associated with a Person, an Action and an Object.  For example, 11 might correspond to a tattooed Queequeg hurling a harpoon. The object part of the image (a Tattoo) does not necessarily have to be the object of the action (Hurl), but it helps if the image is related so that remembering any part of it will help recall the other parts. For example, while the word tattoo points directly to number 11 according to the Major System ("1" = "T or D"), Queequeg as a Person doing anything else, or any action involving Hurling something, also refer to number 11. Therefore each of 100 actions should be distinct enough not to overlap in meaning, but capable of acting upon many objects.  The Objects should in general be distinct from Persons ("Nemo" for number 23 was an exception because few object words were found having only "n" followed by "m").

To use this PAO system and make it personally useful, first it is necessary to obtain or construct and then memorize a personal library consisting of 100 persons, 100 unique actions and 100 objects of action. One way is to begin with a list of Objects corresponding to the Mnemonic Major System rules (see below). Another way might be to start with a list of Persons.  In my case I started with Objects.  For example, "onion" is an object which corresponds to number 22 because it contains two "n" consonants (vowels do not count). Then a Person and Action suggested by this object was chosen, in this case Job weeping over an onion. After selecting 100 objects, next I selected Persons and Actions suggested by them.  I had to make a lot of revisions to get Actions which did not overlap each other but which were still general enough to apply to many objects.  Consider the handful of actions involving water: 23-Dory-Swim-Nemo, 31-Thor Heyerdahl-Float-moat, 69-Ulysses-Sail-ship, 72-Lewis & Clark-Paddle-canoe, 86-Old Man & the Sea-Row-fish. These Actions are distinct enough not to be confused: Swim, Float, Sail, Paddle and Row.  I had to replace a preliminary image of Aguirre, Wrath of God, drifting down the Amazon with a different image of Lewis & Clark, because Aguirre's raft was too similar to the Kon-Tiki raft even without Kon-Tiki's sail, and moreover Lewis and Clark used canoes, not rafts. I also wanted to avoid unpleasant persons. Most of my Persons were chosen for attractive or admirable qualities to invite them to reside in my memory palaces.  I avoid violent actions and all sexual actions even at the cost of some mnemonic emphasis.

In theory, any sequence of six digits can be converted into a single composite image by combining the Person for the first pair, the Action for the second pair and the Object for the third pair. The vast number of possible combinations (100 * 100 * 100 = one million) produces memorable composites. Each composite image is deposited along a path threading a memory palace (Method of Loci). This in turn requires developing personal familiarity with a memory palace such as a set of rooms in one's home or a set of landmarks in the local neighborhood. Memory retrieval is accomplished by retracing the path taken in the mental palace, recalling the image of the composites deposited at each location and converting them back to their corresponding numbers.

For the problem of odd-length numbers which do not break up nicely into pairs of digits, they can be considered as being composed of overlapping pairs, for example 123 = 12 + 23.   In my experience, after having perfected a good set of Actions which took a number of months, combinations involving of Action + Object yield more memorable images than Person + Object.  When only an Action and an Object are involved, sometimes it is convenient to replace the Action with an Adjective, since there is no confusion about the ordering of the numbers if the Object is always the last number pair. As an example of Adjectives or Past Participle functionally equivalent to Actions, consider these three-digit numbers, treated as overlapping pairs: 023 = 02 + 23 = splash + Nemo = "splashing Nemo". 598 = 59 + 98 = Dance + Beef = "dancing bull". 835 = 83 + 35 = Laugh + Mule = "laughing mule". 942 = 94 + 42 = Polish + Rhino = "polished rhino".

As of 11/2011, I am practicing on translating six-digit numbers to composite images.  The development of the memory palace assignments is postponed for later.   I recommend the site http://www.random.org/integers/ to get a page of integers.  Select 400 integers, 10 columns, to get vertical lists of 40 integers each column.  When the paper is folded in half, this gives a working set of 20 numbers to practice with.  Then the creatitve challenge is to make the combination of Person-Action-Object somehow relevant to the Person, knowing something about the Person's character. For example, consider the number 511740 (Madame Curie - Back off - Rice).  Knowing that Madame Curie was French reminded me of Marie Antoinette who supposedly said of the peasants "Let them eat cake" if they could not get bread. So I imagine Madame Curie backing away from eating common white rice because she may have had a delicate stomach as a result of radioactivity in her lab.  Practicing like this, imagining scenes which do not exist in reality but which relate somehow to my store of knowledge of the world, may have a beneficial effect of exercising an aging mind.

Little flash cards cut in quarters from 3X5 index cards can help to memorize these lists of 100 items. The more sophisticated electronic flashcards by Anki (free download) are also useful and may include images as part of the answer.  I found it useful to create three separate lists for Persons-number, Actions-number, and Objects-number, rather than to combine all three aspects for a given number.

#  Phonetic Table of the Mnemonic Major System, with optional colors
0  S                            s sibilant as in "z"ero                    Black
1  T, Th or D            t or d = single stroke like 1            Red
2  N                           n =  2 vertical strokes                   Orange
3  M                          m = 3 vertical strokes                   Yellow
4  R                           fou"r"                                            Brown, Beige, Magenta
5  L                           L = Roman 50                                Silver  *
6  J, Sh or Ch            j =lower loop like 6                       Gold *   
7  K, hard C or G     K contains two 7's sideways         Green
8  F or V                   f = two loops like 8                       Blue
9  P or B                   P = mirror image of 9                    White

*The Magpie Song:
"One for sorrow, two for joy, three for a girl, four for a boy,
                                  
five for silver, six for gold, seven for a secret that must never be told."