The Colour Swirly Thing is a JavaScript jobby for swirling colours round.
You can use it to affect the whole background of a page or just individual elements.

Here's an example of The Colour Swirly Thing in action:

Here's what the colours are doing:

Red: Green: Blue:

And here are the values that keep it all ticking over. Play around!

Min. colour value: 0 50 127 175 192 Pause: 10 50 100 250 500 Steps: 2 4 8 15 20