Set a screensaver as a background for Desktop? I have a really nice Matrix  inspired screensaver. I would like to have the moving screensaver to be placed as my Desktop background image. 

How can I set my screensaver as a background image for the desktop ?
You have to open terminal and type cd /System/Library/Frameworks/ScreenSaver.framework/Resources
and ./ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine -background. It will take a lot of resources though, so to quit it, you have to quit the terminal window.

source: TUAW and Lifehacker