I'm sure that it would not be too hard to paint, powdercoat or anodize the casing yourself,
albeit at a price (~$100) and you would void the warranty and have to take it apart to prep it.
Not something that everyone can, would, or should do.
Great idea but....
These guys at Schiit are just a small startup company.
Keeping things uniform and simple is instrumental to moving product out the door and their bottomline.
Too many options complicates things.
Maybe in the future as they grow, they may diversify in this area of product styling..