Step 1: Get Some Junk!
A roll of LED lights off eBay, a simple trigger from RadioShack, some wire and a battery from my power drill. Plus a few zip ties, 2 blade connectors and some tape.
Step 2: Wires and Ties
The battery was going to be attached to my belt behind me, so I made the lil plastic holder with zip ties to hold it in place. Blade type connectors made it easier to connect to the battery, and just twisting the wires and holding with hot glue (This wasn't going to be a permanent set up, so no need for the solder and all that).
Tape added to tame down the colors on the end (didn't need it glowing under my tutu...).
Last pic is just a quick flick of the palm held trigger.
Step 3: Take a Walk!
LED is a great, easy, and versatile little element to work with and can add the extra hoorah to your costume. Have fun and thank you for reading!