TheCoolist has collected "10 excellent light graffiti artists from around the world, dating back to the days of Picasso... So set your shutter speed slow, grab a flashlight" and visit Light Graffiti: 10 Masters of Light Painting Photography.
Check out also previous posts on light graffiti from TheCoolist. Click on the tag graffiti for AEP posts on graffiti and light graphics. A few After Effects tutorials were noted in Light graffiti in AE.