I found this really cool site of free desktop wallpaper. It's really cool looking, and some of the ones trying to be funny are fairly hilarious. My favorites were:

Homies
The End
The Sea
Top of the Foodchain
Hamster
Robot Love
The Law
Zoo

They kind of remind me of this one style of illustrating kids books that was crazy popular when I was little then kind of petered out. Anyway, I went through and looked at every one (there's over 100), and most of them are pretty cool.