They are also called coral snows.
There are many different ways of creating them.
One way would be to mate a snow with a ghost to get anerys het hypo het amel. Then cross these together to get hypo snows. The only thing is that you would also get plain snows from this crossing as well, so you would have to hold back all snow babies and do breeding trails with them to determine if they were also hypo.
My snake was sold to me as a regular snow, but after asking the breeder some questions, I found out that it could only be a hypo snow due to the parentage. For those that are curious, I was told the parents were a snow and a ghost, but only ghosts and snows have ever been produced from the pairing, no anerys. This lead me to the conclusion (after many punnett squares later) that the parents must have been a hypo snow and a ghost het amel. Maybe I shouldn't call him a hypo snow since I haven't proven him as such, but AFAIK there is nothing else he could be.
Don Soderberg (South Mountain Reptiles) is the only person I know of who is working with these. You might want to contact him about them, as I'm sure he could give you a lot more info.
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alstiver@hotmail.com
Current snakes:
1.0 '01 Hypo snow cornsnake (Tesla Coil)
0.1 '02 Ghost (pastel) cornsnake (Banshee)
1.1 '02 Bloodred cornsnakes (Desi and Luci Too)
To be added in February:
0.1 '98 Het Hypo, Het Caramel cornsnake
1.0 '00 Hypo Het Caramel cornsnake