Subtle and relaxing to watch, colours face in out like a splotchy painting constantly moving.
A processing/java applet that draws concentric circles across a grid to create a dynamic fading colour pattern.
There is a line of symettry from top left > bottom right on the image.
I've tried to add dozens of random/noise based elements to the image, trying to make each pattern as unique as possible. The size of the circles is one of the main limiting factors however.