I just saw one of your pics showing a corner edge of a clear frosted finished, acrylic material case. NOW that's what I'm talking about.
If you could offer a finished keyboard case that is frosted (non-shiny) coating to it then they would be superb. Plus you could apply that same treatment to any colour like Red, Blue, Purple, Green, Yellow, Orange, Grey and Black (if those colours are available).
You need to put up a selection for a frosted finish (don't know what else to call it) because it will be far more suitable as a 24/7 keyboard sitting in dusty environs.