Explanation of Perlin noise, for those who are unfamiliar (like me): <a href="http://en.wikipedia.org/wiki/Perlin_noise" rel="nofollow">http://en.wikipedia.org/wiki/Perlin_noise</a>
It's rather hypnotizing like that. I wouldn't mind having a fireball like that as my desktop background. Never mind the resource usage and all that, because this has character!