Here's a fun thread- one of my favorite things about NaNoWriMo is getting a cover for my beautiful soon-to-be-a-bestseller novel. I either make a crappy one on my own or recruit friends to design me a pretty one, and this thread is for both those things. If you've made a cover, show it off here. If you want a cover, request one here and maybe there will be art-savvy people floating around to make one for you!
I've already made one for this year's novel, though I'll probably make/commission a few more before I'm satisfied. Take a look here!
By the way, if you can't find someone to commission for you here and/or you suck at art, I highly suggest you go over to the artisans forum topic on the NaNoWriMo site forum. Lots of people there would be willing to help!