Color me bored. (badum tss)

Get it with this command:
pastebin get rXQhBupz circle

For every pixel on the screen, it takes the distance to the center of the screen (adjusted for scrolling) and, well, does its thing.
For advanced (golden) computers, but can be viewed in a limited color mode with gray computers. Also requires ComputerCraft 1.7x (for minecraft 1.7.10). If you have the MC1.8.x version of ComputerCraft, then you can use the argument 'blittle' to make it look smoother at a framerate cost. (that would be 'circle blittle')

It looks REALLY cool.

Here's the forum post:
http://www.computercraft.info/forums2/index.php?/topic/26618-circular-screensaver/

In case you're wondering, I am LDDestroier.