Drempels makes colorful, swirling, hallucinogenic patterns that resemble a hurricane or tornado. It normally runs in your Windows background or desktop, replacing your old still-image wallpaper with beautiful animated visuals. Meanwhile, you can use your computer just like you normally would. It uses very little CPU overhead--so little that it even runs smoothly on a 233MHz system. Drempels can also be used as a screensaver; in this mode, it goes full-screen (like a normal screensaver) instead of rendering to the desktop/background. It was created by the author of the Geiss screensaver and Winamp plug-in.