You’ve seen many examples of “light painting” around the web. However, I think the best I’ve seen was by Dave Black. He also wrote a great article about techniques he uses when doing this, and you can find it on the Nikon website.
What is involved with light painting is using a hand-held light source, commonly a flashlight, but it could be about anything. Essentially, you use a long exposure and then selectively light your subject with the flashlight to attain the effect you are looking for. It’s a bit of trial and error, since your metering system is mostly useless and may, therefore, take several exposures before you get a satisfactory result.
For this image of “boots”, I set up in a darkened room with my X100 on a tripod. Then, with the lights on, I set the focus and made sure it was in manual focus for the shot. Finally, with the lights off, I achieved this result with a 5 second exposure at f/8.
What’s really fun is to take a look at the RIT (Rochester Institute Technology) annual Big Shot! They’ve been doing this for quite a few years, and had over 1,000 people helping with the lighting on last year’s project. This way, they are able to add lighting to an impossibly large area for their photograph. It’s really amazing so check it out! ☺
Fujifilm FinePix X100
Lightroom 4 (beta)