Five X Windows Background Hacks You Probably Didn't Know
Every now and then I stumble upon a nifty little desktop background hack, and after noting them down for a few months, discovered I had enough to make a blog post.
All of these will be variably available here and there on POSIX Unix-like systems. But some distros may not include any of them! The solid color declarations come from a file most X windows setups should have, rgb.txt, which should be in /usr/X11R6/lib/X11/. Have a cat through it to see what declared colors you can use.