Vista's actually got some stuff I wouldn't mind seeing in Leopard - those video wallpapers? They're classy as hell.
You can make your screensaver act as a wallpaper. I made a shell script to do that for me. The command to execute the screen saver on the desktop is this:
Code:
/System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine -background
Basically, it is the screensaver application, but with the command -background added to make it run as your desktop background.
Just copy and paste it into Terminal, and press enter. Close terminal to stop it.