The Open Heart is an LED matrix of individually addressable LEDs. It can be used to create a broach or bag light with highly customizable animations. It can be configured so that you can temporarily attach it to fabrics with headers that you simply push through, or you can sew it into a project using conductive thread/wire for a more permanent setup. I have also created a simple flash programmer that you can design animations with, and it will generate the Arduino code for you. That way you just copy, paste, upload, and enjoy.
You can check out the instructable to build it yourself,. The new version 2.0 kit is easier to assemble with a high quality blue PCB, has brighter LEDs, and comes with a pre-made cable all for the same price as the previous kit!