Purple is on the way I just have not had a chance to make them. The three coats of paint makes them take over a week to make a single batch. I have thought about the gold and silver ones but they wouldn't be translucent and I think that is one of the big appeals of them. I will be seeing how many requests I get for those colors to decide if I will make them. The paint is very expensive so even just trying it isn't something I can do without a lot of interest.
My profit margin on these is actually pretty small. I only make all these things because I love them and want to spread it. The bit of extra cash I can put towards my student loans is just and added bonus.