Mac OS X only: Today Google releases Top Draw, a nifty image generation application that rotates its creations on your desktop. Top Draw uses scripts to create colorful psychedelic images, and sets them as your desktop wallpaper with an option to automatically refresh at an interval you set. A Google Mac developer writes:
The Top Draw scripting language leverages Apple's Quartz and CoreImage rendering engines for graphical muscle. In addition to the drawing commands that are supported by the HTML canvas tag, there is support for particle systems, plasma clouds, random noise, multi-layer compositing and much more.
After just a few minutes, Top Draw's given me some beautiful images. Top Draw is a free download for Mac only.