AnalogueAesthetics creates hand-crafted accessories inspired by all things mechanical, chemical and electrical. One of their products that can be purchased on Etsy is this gorgeous ring that includes an integrated microphone. What I like about this design is that the artist wasn't afraid to let aspects of the technology directly inform the aesthetics. In this case, the grated pattern found on old microphones creates the main aesthetic texture that is also functional. I'd love to see the gestures that people make recording audio from this device.
If you're looking to buy one, it looks like they're sold out. Contact the designer here and request a backorder! *drool*