Dang, I feel your pain. :< I am so not feeling my muse for my Big Bang fic, and it's got Sheppard! D: Anyhow, I would just suggest looking at fanfic100's user profile. They have their table up, and you can just skim it to see if anything fits. I also like prompt_in_a_box's old prompt entry, so people can pick up old ones they liked. There's also the hilarious CreativeWritingPrompts.com. XD I dunno if that's what you're looking for, but I hope it helps.