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How did they get that coloring result?
OK here is the image he is talking about:Click Here
I think Fractopolis blocks hotlinking because I don't see it in the thread despite the code being written properly.
It looks like a "normal" color palette in Chaos Pro (or other similar programs) looks to me. Try one with Lots of lines (bands) in the palette. I wont have time to play and try to duplicate it until the weekend.
I don't think there is any special mapping algorithm going on, but I hope those more familiar may have an answer now that a link to the image in question has been posted!