My Idea: (I will do it, I swear)
Curator.
The premise: A museum curator (one player) has to protect his museum from thieves and satisfy tourists by continually adding more art. The other players will the the thieves.
The curator will be RTS-view style, and the thieves will be FPS.
The curator can make various security features, and buy various things to keep customers happy. (More art, food court, speeches n' stuff, traveling exhibits)
While the curator is getting started, the thieves will start out with a crowbar. The museum starts with a basic security system, so rushing in without a way to disable it isn't going to work. They have to steal from nearby stores first, to make some quick cash, then stock up for the big heist.
The game ends after 10 minutes, or when the curator's customer happiness is at 0, whichever comes first. Whichever side has the most money at the end wins.
Sound like a good idea?
Edited:
I'm making a gamemode where you have to steal paintings.
we posted our ideas at the same time......................... hmmmmmmm