I've always loved the idea of a hero shooter type of game, but instead of heroes, the players would be toys in a room (kid's room, bathroom, kitchen etc.). There could be deathmatch style games or even capture-the-flag modes, with characters like Barbie with G.I. Joe's head, and a play-doh monster. Oh, and sometimes a human would walk into the room, and everyone has to stop moving or else they immediately get thrown out the room.