But seriously, you know what theme I think someone should try someday? A SS1/2 themed mafia game(or something cyberpunkish in general). ^___^
It's actually a project I was toying with. Full of bad ideas. It involved dormant mafiosi getting activated during the game : one or two players switching affiliation mid-game but with the general idea being announced both before start, and when it happens. Not exactly cultist, as it's a very (mod-)controlled one-time thing, and there's a warning that someone has changed affiliation, but maybe even that way it could get too irritatng already. But I liked the idea of people actively trying to determine who has changed strategy, knowing from what exact moment to look for that.
Still, my point was : cyberpunk was the flavor in which I saw such a thing make mot sense.