I have a vague idea, inspired by a thread in NaNoWriMo Ate My Soul entitled "Your Novel's TV Tropes!" It, of course, contained a link to the dreaded site and I got sucked in. I then concluded that it would be fun to sort of do it backwards--instead of looking for Tropes in my novel, I would surf through random pages on TVTropes and make a novel out of them. A bit later, I stumbled across the Tropes of Legend page, which is the most oft-referenced tropes on the whole site. I thought it would be fun (and outright silly) to cram all of these into one terribly cliche, over-the-top story.
But, I still have no solid ideas and I'm just not as enthusiastic as I could be. Most of my waking hours are spent creating a religion, language system, etc. for my other, non-NaNo project. Maybe I'll be a NaNo rebel and try to get a 50k-word outline or encyclopedia or something.
*sigh* I not good at decisions.