Oh let's see, my ideas.
First is a bit of an oddball. The effective plot is that a nuclear apocalypse happened, and somehow the radiation turned some people into some rather nasty beings called Reavers who have a taste for human flesh. Eventually, the humans seal themselves away into some underground fortress under the protection of some golems called the Guardians. At the time of the rp, the power source is starting to go down. The main trouble with this one is kind of lack of a villain who's motive isn't OMNOMNOM HUMANZ ARE TASTY!
The other one holds some promise. I came up with the concept yesterday, some game show of death where if you win you get 1 million dollars, and if you lose you suffer a horrible death! Not helping matters is some reality warper sadist who teleported everyone (about 100 contestants) to the place and is hosting the show, and his tendency to kill off people who aren't giving a good showing.
Yeah, these ideas are really odd lol.