Benback is a perl program that randomly chooses an image from a directory to display to the background of your screen. It chooses a new image every so often (configurable).
There are other programs out there that do the same thing, in fact, most of them do a better job. But I wanted to learn something about perl, and so I wrote my own. You are welcome to use it if you want. If you want to check out the alternatives, search freshmeat.net for keywords such as "background" and "image."
Download benback, version 0.9
If you're interested, my real homepage is here. I warn you though, it hasn't been updated in a while... Many thanks to my roomate Vineet, for helping me admin this machine!