I designed some LED blinkie circuits in eagle and then tweaked them by hand in order to make them into handle badges for myself and two others at DefCon 21.
This is a bouquet of lightbulbs made from hobby glass ornaments, vinyl tubing, 3D printed fixtures, and amber LEDs controlled with a dip ATMega 328.
This pair of goggles has three bat switches on the side of one eye piece which control the RGB channels of the LEDs in each goggle. There is also a toggle switch that allows you to change each eye's color individually.
This pair of goggles makes use of light pipe to simulate red and blue neon rings in each eye. There is also a pull sting switch hanging off the side to turn them on and off.
This pair of goggles was inspired by the Arc Reactor. They have a home etched circuit with an ATTiny 2313 on board that has a few different modes stored which adjust the speed and mode for the patterns of the LEDs.
This pair of goggles uses a basic photo theremin circuit involving a couple 555 timers to create a wearable accessory that you can 'play' by waving your hands around the side of your head, changing the pitch and tone.
This was my first Kickstarter campaign for a miniature delta robot kit. The funding helped me build a massive light installation that involves networking hundreds of these robots together for a super awesome, interactive robot army experience.