These are some seeds i found while playing superflat:
#1 Revengeofthepig! This one spawns you in front of a NPC village with two blacksmiths: 2 diamonds, 8 iron, and 5 obsidian, along with some bread and apples.
#2 Idonotknowwhattocallit this one also spawns you near a village, however it has no blacksmiths and to get to the good stuff you must go die, yes if you die you will respawn near two villages with a total of three blacksmiths: a iron sword and pick, 6 saplings, 5 iron, 9 obsidian, 3 diamonds, and a pair of iron leggings and of course some bread and apples.