No matter what you're dressing up as, wearable illumination is a guaranteed way to make your costume the star of the show. Getting yourself glowing can also be very practical: illuminated friends are easy to find in a crowd, and lights help everybody stay safe on the streets at night.
Dress up as Daft Punk, add a arc reactor to your Iron Man costume, or create a whole character inspired by bioluminescent sea creatures. From fiber optics, el wire and LEDs to actual fire, there are many ways to incorporate glow into your outfit this Halloween.
Here are some of my favorite examples from Instructables authors. I've also included a few basic tutorials on different kinds of lights at the bottom of this list to help you get started.