Using torches and long-exposure cameras on tripods to make beautiful pictures in the dark. Best outdoors.
See expert images here for example: http://digital-photography-school.com/25-spectacular-light-painting-images
Also try using Glow Sticks to get italic/wide lines as well as different colours. Have multiple people in the same shot to get whole words
camera with ability to adjust exposure time
tripod or suitable support to rest camera on
light sources (torches, glow sticks, sparklers)