Desktop Graffitist - Vandalize your desktop!
review by ClifNotes, Jul 2006
Sweet! This is a tiny program that will help you when you are either stressed or feeling creative. Just launch it a paint all over your PC. Hitting the number keys, 1 to 0, will change the colors. To save the pictures, you'll have to hit the PrtScr key and paste it into a graphics program.
Quote from the website
Desktop Graffitist is a small program that enables you to spray paint your desktop, and anything else that might appear on screen. DG is designed for recreation and creativity, and can be used to relieve office stress and boredom.
http://www.roggel.com/NGNeer/DesktopGraffitist/