Couple of days ago when I was really bored, which doesn't happen that often, I sat down and created a few wallpapers from backgrounds in Chatzilla. Very simple ones, but they have the advantage of not distracting from the work at hand. Personally I can't stand wallpapers on my desktop that are too busy, when you can't even find your icons anymore. I mean I like nice wallpapers and pictures and even use some I've taken on my holidays, just not the too busy ones. Sometimes it's better to just get a picture frame.
Anyway, here's my background from the Slackware-channel.