I clicked to see it full screen a bit skeptical, but once I saw it in its full glory, I saw how interesting this is. The lighting is superb, and the fan variation (is that what it is?) is a nice touch. My advice would be to get rid of the purple and just have the green, yellow and brown. Also, get rid of the "feathery" texture it has. Just to make it a little more "wormhole"-like.
I can't comment much on fractals, but I really like the colors used, and as Ann said, the "metallic feel". I don't often like fractals as much as photography, but I think this is excellent. It's now my current background...thank you for submitting, and great job.