I'll be building a keezer one of these days and this got me thinking a bit... My mom makes those lit up glass block craft things, kind of like these:
I can custom make these however I want pretty easily. Different words, sayings, pictures, logos, colors, etc... I think it would be pretty great to mount a couple in the collar like little windows. I could even dehydrate some whole hops and seal them up inside or something (without lights of course). Hmmmmmm... I think I may have to play around with this idea a bit!
I guess if a person wanted to, a whole collar could probably be built from these.