A week to go, what to write?

NanoWriMo is drawing closer and I have a little problem... I have absolutely no idea what to write. I've got a tidbit of an idea and a character that's nagging to be set free, but that really doesn't form a novel.

Where do ideas come from? At the moment that is a big question. I'd better get to work thinking about this next big masterpiece before all I'm left with in November is "All work and no play makes Jack a dull boy"...