Bulb

http://www.picturecorrect.com/tips/light-painting-photography-tools/

My camera was on a patio table (too lazy to get my tripod)and I used a 100mm lens along with an aperture of 32.
I set the camera on Bulb and when you do that, you can snap a photo and hold the shutter release button as long as you want. An interesting way to take a photo, especially at night or if you are in a closet. :)