I've spent way too much time tonight playing with this virtual sand art game at thisissand.com
Click the little gray box in the bigger light gray box for instructions. Basically you just throw grains of sand around and can change their color by pressing C. Sounds thrilling, right? Yeah, somehow it is sort of relaxing.
I made a beautiful and time intensive sunset before looking at the gallery and realizing how much mine sucked compared to the good ones. Now I'm turned off, but it was fun while it lasted.