I grind rock, and learned wire work to tinker with my hundreds of cabochons. So I wanted to hang my PV's on my neck, and made some things of wire to do it - guess you could call them holders or hangers:
First one, only big enough for a small 510. Silver knit.
Second one, eGo sized. Silver & blue.
Third one, bigger. Will sit upright. Silver & red.
Fourth one, heavy base, will stand up. Mixed colors, coiled.
Fifth one, also will stand up. Silver netted with blue beads.
Made to hang on a chain, one is on a rawhide cord. A spiral hanger will go on a chain, or on your collar, but come off easily if you want to use it off the chain. The holders don't cover the button, so they can be used without removing.
Learned by error - measure, don't try to dangle stuff off the bottom, get a good fit to avoid it flopping around. Next effort will hopefully include a cabochon. Recent batch of rock includes a small lace agate that I may try, don't want a huge rock for the first one.
I was wondering if these are something people would like... have a lot more ideas to try.