Does anyone have experience using chocolate plastic or modelling clay? I've been researching recipes and they all seem to include corn syrup. I'm aware that corn syrup is completely evil, so was wondering if anyone had successfully substituted it in making chocolate modelling clay?

If not, I'll have to track some down.

What type of colours are best to use?

I understand it can last ok out of the refrigerator. How long would it be ok for?