This is great -- the iNecklace is Adafruit's latest open-sourced, electronic jewelry. It's a pendant shaped like a power button, complete with a pulsing LED inside. It's beautiful, stylish, and a nicely subtle way to proclaim your loyalty to tech in a sleek and cool way. It's all open source, too, so you can go to GitHub and download all of the files and tech setup if you want to try and make your own.
For those of us not so DIY inclined, the iNecklace sells for $75 and will begin shipping in September.