If you breed any type of dragon as long as they are lv 10 you will get them
There is a Bronze Olympus Dragon on sale right now on DragonVale if you were talking about the Bronze Olympus Dragon. If you were just talking about a Bronze Dragon then I don't know.
Blazing and Crystal
Olympus bronze Olympus silver Olympus Gold
You breed the Willow Dragon and the Quake Dragon on the Epic Breeding Island. You also have a chance of getting a silver or bronze dragon when you breed, but you will just have to keep at it! It helps when your dragons are level 10.
ironwood dragon and storm dragon
This will be a crystal dragon.
Crystal dragon
U breed the two dragons ice and sandstorm
There is no such thing as a Birthstone Dragon on DragonVale
you can win them when you get a silver medal or gold medal in the Colosseum, and in the dragon track
No they are not.
As of July 2012, there has not been a star dragon in DragonVale.