Hey GH, first time keyboard modder here. I've been into mechanical keyboards since early 2000's but never actually made one 'mine' if you will. I recently got a Das with blue switches from a coworker&friend but I couldn't stand the overly too shiny top plastic piece so I had to think of something to fix it.
I bought some caps and vinyl from ebay and got to work quick.
I used some 3M 1080 Military Green vinyl and some PBT side printed caps. I think it came out pretty good, but my photography skills aren't the greatest.
and of course, the full keyboard in all of its grainy and poor lighting glory.
There are some imperfections in the vinyl, but I think it is a huge improvement. The military look I was going for came out great.