I know that there are two different models, depending on what you are growing but, I saw this guys who was talking about designing unique appeaarences. You should consider that in the future to release limited edition designs. I think it would really cool!
I think that's an awesome idea, but I don't remember seeing a limited edition refrigerator before, why would they want to do that? Besides nothing is certain yet.
Well to be honest you could always give it to some artist to paint it for you. Other than that i dont think ordering limited design parts would be of any favor cost wise. If they bump up the prices for those limited ones according - maybe. But still the need to find he market for it first.