You can buy a $50 kit to build this beautiful LED persistence of vision wristwatch. (Or pay $189 for the fully-assembled, ready-to wear watch.)
Link (Via Make)
With two time display options (Binary and wave-it-in-the-air POV display) and a super-bright flashlight mode, this watch is sure to turn some heads. Buy as a chip only, a kit to assemble yourself, a preassembled board, or a complete watch.