I really like the yellow one and the icy one. I don't know exactly what I don't like about the red ones, but I think they are a bit too dark and should glow a bit more. And as said already, the wyrmheads on the first pic doesn't fit. Especially when looking at
this pic I saw very clearly that those heads didn't look right. They should look a lot more magical.
I'd suggest something like a more transparent theme, or a bone theme. I still really like those first two I mentioned though, so I'll rep you for those.