http://en.wikipedia.org/wiki/Light_painting check it out~

haha i guess i know a little bit about light painting. basically 1. find a bright light 2. put the light in a dark room 3. set your camera for really really long exposure 4. wave, twist, and turn your camera around while the shutter is open it's much easier if you can manually adjust the exposure time on your camera so you always know how much time you have to take the picture. you can also take pictures of headlights of oncoming cars at night. actually, shanghai would probably look amazing at night. you can just cruise around town, roll down your windows and wave your camera around wildly. hope that helps!