I think this creation of geeky goodness, tops my list for ways to reuse old circuit boards. Etsy seller DebbyAremDesigns got really resourceful when piecing together this one of a kind recycled circuit board ID badge/eyeglass holder (which I'm naturally calling a necklace — hee hee). The artist says:
A funky badge holder made from recycled vintage circuit boards, vintage lucite and glass beads from the 1950's as well as recycled colored "bell" telephone wire from the 1950's! I've also taken very old capacitors from the 1940's and repurposed them into additional decorative components.
I just love how every piece is so unique and different — not to mention, the colorful beads and wire which make it all come together so nicely! Now if only I had to wear a badge at work, I'd be one sexy geek! You can purchase one online for $67.