This picture of a frog catching fireflies is embellished with lights that bring the bugs to life. Conductive thread is the magic ingredient, bridging the gap between rigid metal and soft floss. To make a stitched scene light up, combine traditional embroidery techniques with a few common electronics components. The possibilities are endless, and the result is an artful conversation piece.

http://makeprojects.com/Project/Electronic-Embroidery/44/1

http://blog.craftzine.com/archive/2010/09/how-to_led_embroidery.html