I got the aquamarine silicone case for my 60HEv2 and love it. The style is very unique without being ostentatious.
The low profile it gives the keyboard means that I can take my keyboard around without needing a wrist rest, even if I do still prefer having the wrist rest. Installation was as easy as an ocean breeze.
The RGB shining through the case is stunning! I do still want to get a set of keycaps that are just as unique, but at the moment I'm using standard white PBT keycaps and those look great on the case.
The only downside I can think of is that I do need to wipe down the case with a damp towel every once in a while to get rid of the dust that clings to it.