Bosmer: "The Green Pact" (see http://www.uesp.net/wiki/Lore:Green_Pact)
-Extra health gained from eating meat
-Can cannibalize fallen enemies for health
I also think this is a nice tip of the hat to the game lore, and casts the Bosmer more as badasses, instead of the happy-go-lucky midgets that they have become in recent installations.
if anyone has any interesting ideas for a racial perk, post it below and i will add it.
edit: also fits nicely with the bethesda tradition of adding cannibalism/vampirism or otherwise eating npcs as a game feature.
after some feedback, it seems like that racial perks would be better if they did not overtly limit the player; so don't feel pressured to add a downside to your perk ideas. More ideas are below:
Khajiit: Favour of the Moon (courtesy of artatm)
-night eye
-boost to sprint and jump
-penalties to swim and stamina
Imperials: "Imperial Legacy" (Courtesy of Broken-Scale)
-Bonus health and damage to companion characters
-While with companion, health boost to player, but penalty to movement speed
-Unique interactions with other Imperials and pro-empire characters