I made similar thing few years ago, but with more effects (click to randomize gradient effect) http://lib.ivank.net/demos/plasma.html http://lib.ivank.net/demos

I made similar thing few years ago, but with more effects (click to randomize gradient effect) http://lib.ivank.net/demos/plasma.html http://lib.ivank.net/demos/plasma.html 59 lines of code