Thank God for Argentine design team BCK, whose Color Ring idea could put a stop to those hideous headsets* that make us all look like androids. Consisting of two rings, the larger of which fits on the thumb and acts as the earpiece, and a smaller one which slides halfway down your little finger and acts as a speaker.
Yup, that means that you can make that ubiquitous "call me" sign with your hand. There are distance sensors in the ring that connect and disconnect the phone depending on what you're doing with your digits. And any tech-minded Crip or Blood might have fun modifying this idea. Basic instructions and a bonus pic are below.
*I know the Jawbone is seen as a cut above, but to me it still smacks of ick.