Mentioned this in the other thread that mentioned head badges, but I can't endorse Jen (of Revolution Cycle Jewelry) highly enough. She's freaking brilliant, and has been doing some stuff lately that is just amazing, using multiple metals and stuff like that. I am fairly certain that if you can dream it, Jen can make it. We've also had her do several jewelry pieces for my wife that have all come out amazing.
Some of her recent head badges:
Something a bit more personal - I took a photo of my wife's bike, converted it to a silhouette, and gave that to Jen, who then cut it out and put it on a pendant:
Jen's a true artist, an awesome person, and a serious rider to boot!