How about viewing your favorite screensavers as wallpapers?
Utility that allows displaying JPEG image slideshows with various customization options.

Turn your computer screen into an aquarium with this super realistic screensaver.
Screen saver that displays colorful blobs across your screen.
Very cool screensaver that simulates the effect of rain on your desktop.
Screensaver that displays particle effects in a phenomenon reminiscent of solar winds.