Because the canon design of crystal ponies has so many gradients in it my head exploded when I realized what I was in for. I didn't have a better idea at the time... so I did this. I'm just going to leave this here and let the internet judge it.
Aw, what shiny looking fillies. It looks good, although I think they would look shinier by adding some sparkles around them and perhaps color in some light reflecting off of them, you know, like real crystal. Still, it's not bad for a first attempt.