A fun little idea I had when I saw a transparent background on deviant art: Why not auto-rotate colours behind a transparent background? I am certain the idea is not original but I wanted to work out how to do it. Here it is:
gconftool-2 -t str --set /desktop/gnome/background/primary_color orange;
So far most common colours work: {red, blue, white, orange, grey, green, yellow, purple}
Enable a transparent wallpaper.
Here is the result:
