@ONL What are you into? Except history, of course. I am eying that title of yours. :)
And history would be a good source of RP's in itself.
I wanted to create a historical RP myself some time ago that would revolve around a lost Viking ship crew facing the unknown in an unknown land, maybe North America, and coming back, but with subtle supernatural elements from the Norse Sagas and myth involved, to make it a bit more interesting. I also had the same idea about a space ship crew doing the same thing in a sci-fi settings, with a bunch of time and space fuck ups, sort of like Planet of the Apes meets Hyperion.