I don´t know if someone has suggested it before but what about a cannibal mod, like you can eat dead corpses or there could be a quest involving a cannibal and he lives in like Leyaviin and the guards have found dismembered rotting corpses out in swamps or that you find a hidden chest and you can find human flesh in it or something and someone tries to kill you for finding that chest.
You'd have to think of a legitimate story and plot to go with it. I don't mind writing it, cannibalism sounds like a great idea (for the game that is, I'm not a secret flesh-eating monster... or am I?)
.
--------------------
Have you ever thought about taking the dark and thorny path?