(Click image to enlarge.)
The below image is randomly generated by a software program I wrote as a whim. I think most of them look pretty cool, so I like to use them as desktop wallpapers and you're welcome to do the same. There's no copyright or anything here, go ahead, download the images, use them for whatever you want.
There's one image posted a day, and the archive goes back to Jan 1st, 2011.
(Click image to enlarge.)