Well, honestly, I don't like to ask others for fanfic ideas because they, in telling you the ideas, came up with them. Because of this, I would then have to give credit for the idea behind the story. I prefer to be responsible for everything in a fanfic.
Just rack your brain, there must be an idea somewhere! I've found it quite impossible to want to write without knowing what I'll be writing. In fact, I only want to write once I have an idea, because at that point I can't stop thinking about it until I put it down on paper.
Listen to songs. They always give me plenty of inspiration. And the best thing about that is you really only have to give credit to the songwriter/singer if you use a part of the song in your fic.
Sorry for the lack of ideas, but the only ones on my brain right now are ones that I'm using.
Good luck.
-LWf