I get bored with my desktop wallpaper pretty easily, especially in Ubuntu Linux, where it's nearly the only thing on my desktop. Until recently, that meant scouring theming sites for great artwork, opening the Appearance tab and re-scaling and choosing background colors for each picture, and just general unproductive knob-twiddling. Digging through the Ubuntu Forums, however, I came across a few tools that can rotate customized background images with a shortcut, on a timer, or based on the tim