We could get close to leopard/ tiger/zebra skin but it would have to be done in the Nailbomb/warpig colours. Same goes for stars! Although you could laser etch them on.
We could do different coloured metals, the keys you are referring to are coloured by chemical/electrical anodizing. So the same finish could be applied to covers.
The engraving on covers only comes in one colour, and that’s the colour of the metal underneath, usually nickel.
Glass covers could be made in theory, but would be extremely expensive to manufacture.
As for replacing the screws with led's. The pickup wouldn’t work because the screws are what direct the magnetic field towards the strings!