Battle Screensaver will feature some ships on your desktop and they will fight till destruction.
Furthermore you will be able to choose he number of ships (from 3 to 20) and the shield level so you can configure their power.
As long as the battle takes place in your desktop, you'll see how it will be destroyed and the effect is really funny. You'll see colored ships surrounding your desktop and destroying everything.
Give it a try, it's totally free.