(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.