The KD's have already basically answered this... but i'm going to anyway.
It's incredibly common among KDs to get their badges made into pendants. Technically you can get it made into a ring, but as others have stated, that's an awfully big ring and hard to keep nice.
I have a really plain badge, and just recently purchased one off of ebay that's been made into a pendant. Here's what it looks like if any of you are interested. I think it's pretty neat:
KD badge/pendant