Well, it is cool for sure. The thread I think you are talking about was about some black pastel pieds:
http://ball-pythons.net/forums/showt...rplexing-Pieds
There is a split faced corn, too. He is assumed to be a chimera. If you go through the thread, you'll find lots of updates as his colors came in as he grew:
http://www.cornsnakes.com/forums/sho...d.php?t=130790
I think the half-leucistic peacock is genetic. I'm pretty sure I remember that you can breed for them. Basically it is a kind of pied. But it doesn't usually show as much of a left/right split as this bird (and if you look closely, it is only the tail that is split that way).