That is some really nice looking stuff... but personally I would not use many of them. I wouldn't ever put any caps on keyboard that don't have a more or less normal cylindrical top on them. While others look cool, as a 60% user there is not any key like scroll lock for me where they can sit as a decoration without ever really needing to touch them. I don't like keys that are all lumpy/pokey in my finger. More like zip it, world wide web and cracked would be good. Plain Cherry blank keys would be of much interest to me of course, a small selection like WASD and Esc replacement probably sufficient for me.

If you could make doubleshot like hammer and sickle in Cherry I would definitely take that. Or just in relief/or very very slight raised would also be OK.

I've also had for awhile idea of making something that is very low, top only without sides and the switch stem would come through being visible on the top and be exactly flush with the key top surface. For those a whole set though... but to make it easier maybe have it all be home row like and just have all the needed sizes.