Are you tired with your old desktop? Why no liven it up a bit with Live Wallpaper? It’s only $0.99 USD, and it is available in the App Store.
Not only does this app give you twelve backgrounds to choose from with subtle animations here and there, but it also displays the time and weather. The more active themes do use a non-trivial amount of CPU power, so don’t run this on your laptop if you’re worried about heat and battery life. If you’re plugged into a wall or running a desktop Mac, you can go nuts. The more static themes aren’t very CPU intensive, though. If you want your Live Wallpaper running all of the time, you can set it to launch whenever you log in, but you can choose to launch at will to conserve power.
This is a very neat app, and it is absolutely worth the buck it costs just so you can show off your desktop to your friends. Also, some of the animations are hypnotic, so don’t install this if you have a deadline coming up any time soon. You might find yourself staring at your desktop for minutes at a time.