The Stith Thompson Motif-Index of Folk Literature is not what I'd call a particularly useful text for real-world folkloric studies. It’s a big list of story elements shorn from their context, heavily weighted according to the biases of its composer, and full of entries that are either too broad to be a useful comparison or too specific to possibly exist in more than one tradition.
On the plus side: it’s a big list of story elements shorn from their context which means you can flip to a random page, start reading, steal everything you think is interesting, tweak as you see fit, and build up the religious and cultural narratives of whatever fantasy people you please. Here’s a link: the copyright never got renewed so this whole damn thing is public domain, baby!
For this post I just went and chose at random, but with the way that the Index reduces everything to generically-named components you can easily build a more structured myth by picking an entry you like (weddings, deaths and births are a good place to start) and build out links one by one. I might do that for a second installment.
A Mythology in 100 Parts
- Creator is accompanied by a dog (A33.1.1)
- God as son of 9 giantesses (A112.5)
- Deity born from skull (A114.3)
- Twin (or triune) goddesses (A116.2)
- God with 3/5/6 faces (A123.2.X)
- Maggots in the mouth of man-eating god (A123.2.2.1)
- God with 2 joined bodies (A123.1.2)
- God with 13 eyes (A123.3.1.3)
- God with 8 heads (A123.4.1.3)
- God with a stone head (A123.4.2)
- Goddess of war in shape of a red woman (A125.1.1)
- God in tiger's skin (A131.5)
- Bear goddess (A132.5)
- God's home under tree of life (A151.7.1.1)
- God uses interpreter to speak to women (A182.3.0.4)
- God's elephant (A155)
- Gods covered in red and yellow feathers (A139.9.3)
- Dwarf god (A134)
- God carries siblings in a basket on his back (A137.4.1)
- Goddess appears as coral reef (A139.8.2)
- Animal elders & the angels of animals (B1 & B1.1)
- Dragon as modified shellfish (B11.2.1.3)
- Man-eating mares (B16.1.3.1)
- Ghormuhas: men's bodies, horses' heads, one leg, cannibals. (B15.7.5)
- Burrowing swine heat ground (B19.4.1)
- Sheep with a fiery collar (B19.4.3)
- Giant swimming raven (B31.3.1)
- Air-going elephant (B45)
- Flying crustacean (B48)
- Deer with one gold and one silver antler (B15.3.2.1)
- Frog with magic knowledge (B126.1)
- Animal languages learned from ghosts / spirits (B217.3)
- Magic dead pig (D1281.1)
- Clairvoyant tube (D1323.9)
- Star-deity and drought-demon fight (A225)
- Angel of the deep (A421.0.1)
- God of the Squid (A455.1)
- Goddess of Smith-work (A451.1.1)
- Water spirits have hearth made of three human skulls (F420.2.5)
- Abandoned infant lives by eating corpse of murdered father (G25)
- Witch has 3 giant sons (G206)
- Witch with iron teeth (G314.2)
- Witch with 15 tails (G219.8.1)
- Witch has extraordinary physical strength (G221.3)
- Moon punishes for breach of tabu (C905.2)
- Transformation: man to peanut (D222.1)
- Magic drink causes insanity (D1367.2)
- Blood of salamander protects against fire (D1382.13)
- Magic red stone protects from poison (D1383.6)
- Earth from saint's grave expels demons (D1385.1)
- Magic sight given to child + magic sight given by dead person (D1821.6 + D1821.8)
- Rejuvenation by song of pelican (D1889.3)
- Covenant of friendship (P311.5)
- Student enters competition with their teacher (P342)
- Woman disguised as monk enters monastery (P426.3.3)
- Impregnation by lightning (T528)
- Lesbians give birth to monsters (T462.1)
- Hunting is a madness of kings (P12.1)
- King descends to bottom of sea in glass barrel (P15.5)
- Princes as smiths (P31.1)
- 2 brothers become pirates (P251.5.1)
- Twins freed from mother's rotting corpse (T584.2.1.1)
- Mother kills husband for murdering their daughter (P211.2)
- King mourns wife's death so much he becomes a pirate (P27.2)
- King never touches earth; carried around by slaves (P14.5)
- Inauguration of king as espousal to goddess (P11.6)
- Woman paints face to become pregnant (T579.8.2)
- Child with several mothers (T589.9)
- Children from a well (T589.6.4)
- Child born each day for a week (T586.5.2)
- Marriage by drinking festival (T135.6)
- Marriage of girl to sword (T117.2)
- Wife goes to land of dead to procure husband's heart (F81.1.1)
- Stair to lower world (F94)
- People of the lower world emerge to drink and dance in the evening (F108.2)
- Journey to the Land of Women (F112)
- Journey to Land of the Unborn (F115)
- Submarine monastery (F133.3)
- Witch's house at border of otherworld (F147.3)
- Ogres harnessed to plow (G675)
- Blood of 5 ogres: yellow, red, white, green, black (G367.1)
- Devil employed as midwife (G303.9.3.2)
- Woman requires 30 men (as husbands) (T146.2)
- Wife hides husband's infidelity from emperor, shelters his mistress (T222)
- Pot so heavy with ghosts that girl cannot lift it (E499.3)
- Speaking and bleeding trees; reincarnated persons (E631.0.4)
- Noah saves a giant on the ark; too big to go inside, has to stay in the rigging (F531.5.9)
- Stolen animal's meat impossible to cook (Q212.4)
- Punishment: Imprisonment in white-hot iron house (Q414.2)
- Princess (queen) compelled to keep an inn (Q481)
- Abduction by goddess's cat (R13.2.3.1)
- Captivity in subterranean palace (R41.1.1)
- Girl hidden in skin of dead mother (R318)
- Intestines wagered (N2.3.5)
- Evil spirit harpoons sleepers (F402.1.11.3)
- Recognition by hole burned in hand when woman removes glove (H56.1)
- Quest for golden wood for knife handle (H1359.1)
- Wolf tries in vain to be doctor (J512.5)
- Beaver and porcupine trick each other (K896.1)
- Fox disguised as scholar (K1822.2)