(If you've got lightsticks, check out askacollegekid's light instructable!)
Camera with long exposure capabilities (the longer the better)
Source of light (flashlights work the best)
Pitch black room (if you want a nice black background)
Note: Please excuse my room's messiness!
Subnote: I'd like to thank StepsoftheSun for inspiring me to make this Instructable =)
UPDATE!: Yesterday was the "annual" Science Olympiad paratay!
I brought a camera and some lights and we made some pretty nice pictures (added pics to the intro page)!
Step 1: Set Up
Take a regular shutter speed shot in the light to make sure that your spot is in focus (see picture)
Set your camera's shutter speed (you'll have to set your camera for manual mode) - I use 30 seconds most of the time
Either turn on a time delay or set the shutter speed to compensate for the time it takes to walk 10-15 feet away.
Grab your flashlight and shut the lights out.
Step 2: Take the picture!
Draw the picture you want, trying not to shine the light source directly at the camera. This will produce a "twinkle" where you shined it from (see picture).
If you want to stop a line segment and start a new one, you can cover the light source with your hand and move it over to where the new line segment will start. If you have a flashlight, just turn it off, move it over, and turn it back on! <-- Much easier!
When you're done drawing:
If it's a simple picture (a square, circle etc) you can go over it again
If not, don't bother trying to go over it. It will probably get messed up.
DO NOT TURN THE LIGHTS BACK ON UNTIL YOU ARE SURE THE CAMERA HAS FINISHED TAKING THE PICTURE!