Here’s a Quick Tip from MacResearch.org
1) Set your screen saver to something cool (I use the RSS Visualizer)
2) Fire up terminal
3) Type the following:
/System/Library/Frameworks/ScreenSaver.framework/Resources/
ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine -background
Look at your Desktop.
To stop the whole thing and return your desktop to normal just stop kill the process (^C).
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neat! pity you have to let the terminal window open, though.
You can set this to work on startup by doing the following:
from the terminal:
$ echo /System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine -background & > saverBack
$ chmod +x saverBack
$ ./saverBack
To run this in the background on every startup just add it to your Login Items in the Accounts preference in System Preferences.
Small correction. Put a backslash before the ampersand like so:
$ echo /System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine -background & > saverBack