Wow, thanks for all the positive comments guys, but I don't deserve them.
The set up is SO simple it's untrue. I'll post the .tgd on the shared area for you to play with. It's without an image map for the JuliaBrot, but just replace it with one of your own that gives the look you like.
The "ice" is a con. It's just the water shader tweaked and placed over the right coloured layer that when viewed from above with the correct lighting gives the impression of ice.
The real cleverness about the image is Volker's Julia set.
If anyone uses this I'd love to see your results.