xBack is a utility that allows you replace your desktop picture with a screen saver. With xBack, you can bring your desktop to life.
Quickly start/stop the desktop screen saver
Easily change the desktop screen saver
Configure screen saver preferences without having to open System Preferences
Preview screen savers without having to open System Preferences
Menu based usage - no wasted space in the dock
Quartz Composer support ( Mac OS X v10.4+ Only )
Different Screen Saver for each display
Works with iPhoto - view your iPhoto albums on your desktop.
Create your own Slide Shows to share with others.