At Maker Faire Austin, Jimmie Rogers gave me one of his Open Hearts to work into a portable brooch. I used a LilyPad Arduino board and sandwiched the two back to back, using two layers of fabric to insulate the circuit boards. I used conductive thread to make the connections, and I dangled the board sandwich from the LilyPad power supply, to which I attached a safety pin for making it a brooch. Because of the way I made it, I have access to the programming pins on the Arduino so I can change the animations any time I want.
Here’s a video of it in action: