Need a quick toddler (or adult) costume? Here's one that can be done in about 5 minutes, using common household items.
You will need:
* a solid colored shirt
* a hat (same color as shirt)
* tape (white for dark colored shirts, black for light colored shirts)
* a pair of black pants (leggings work great!)
Step 1: decorate shirt
Using the tape, put a diode symbol on the front of the shirt.