xBack

Version: 3.7.5 || Release Date: 2007-08-26 || License: Shareware ($10 US) Developer: Gideon Softworks | App Owner: jailerjoe

xBack is a utility that allows you replace your desktop picture with a screen saver. With xBack, you can bring your desktop to life.

Feature list:
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 )
Expose Compatible
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.

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3 Opinions

That does have its advantages, but my menu-bar real estate is really valuable. And, you can save terminal commands so it's just an execute-to-start thing.

In case you don't like typing terminal commands use Backlight: http://osx.iusethis.com/app/backlight

Ehh... not a bad idea... but you can do its main feature with a single terminal command (make sure it's on a single line):
/System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine -background

Having said that, I haven't used it, so I'm not sure how useful the extra features are. Worth $10? Your call.