You’ve probably heard of light-emitting diodes, a type of energy-efficient light. While they’re good for practical reasons—say, illuminating a room or a passageway—they can also add a little bling to clothing. To incorporate LEDs into your favorite accessories, you’ll start by creating a basic circuit from a battery, two pieces of wire, and an LED. You’ll then modify this circuit so that you can turn it on and off using fasteners like buttons, zippers, laces, hooks, and buckles. If you’re interested in trying this with a class or camp, check out the related links.