I've had some professional designers working on this project actually, here is where their designs stand...any input that I can forward on to them would be helpful. As I've said elsewhere, I didn't make these, so feel free to bash them as you will, but constructive criticism is best.
Top row in the middle looks best, though a little bit too much plastic feel. Maybe some kind of jade texture might give it more "precious" feel as well as maintain green color.