The keyboard may resolve around the theme of the beetle group prosopocoilus. They are known also as stag beetles. Famous for their beautiful mandibles each of them has different mandible features. Like one of my facourites the prosopocoilus nobuyuki. They have one of the largest figures in the prosopocoilus group. My idea is maybe there could be few popular themes of these prosopocoilus group beetles. Each with their head and horns of different design engraved on the bottom case. If possible maybe could incoporate the beetle wings of different kinds on the carrying case. Whats special could be the brass logo somewhere on the board which would represent the beetle. Making each board special for these beetles. The side of the case may also be fitted to their shape like samurais giving off a japanese vibe.