So asking for a unique interior for each set is a bit extreme and unlikely going to happen. It would also probably not be desirable for the interior to be some crazy design for the sake of being able to move around and find things easily.
However, a separate cosmetic slot to varnish the wood various colours would be nice! It could be 4/5 options that you can buy from the usual place. Darker woods, lighter woods, maybe a slightly pink-tinted wood? You get the idea. Nothing extreme, but just a nice option!
