Here are some silly shots that were taken tonight while testing the "painting with light" technique. here is a blog describing some of these techniques:
http://katiespapa.blogspot.com/2005/03/light-lines.html
Also interesting is the use of a hotshoe flash (i use a Canon Speedlight 580EX) off of the hotshoe and fired multiple times at various locations in the field of the camera to paint the intensity of the lighting onto the scene with the shutter open. I used a 25 second exposure started with the timer (to minimize shake) and then ran around my yard firing away at the trees. here is an example:
Also interesting is the "multilight" approach to lighting an object with the same multi-flash in a single exposure technique. Here is the exposure:
and here is a wide view showing me frantically running around the yellow kiddie car firing the flash at various intervals during the exposure:
Finally, here are some examples of painting on an invisible canvas a la Picasso:
This was sort of a cool image because the lamp I use has both a halogen (orangish) and LED (white) lamp - I mixed the two lamps during my flailing around with the shutter opened and got the mixed colors.
Thisis the headlamp i used.
And one with a second curtain sync'ed flash on the hotshoe:

.
What that basically means is that the flash was set to fire right before the shutter (the second curtain) closed. So, I started the timer, ran in front of the camera, the shutter opened, I got out my LED headlamp and wrote the word "Hi !" and then the flash fired while I posed next to the "writing" area. The last two images have sort of a low-contrast haze on them because I forgot to cover the viewfinder so light leaked in through the eyepiece - apparently that is what that little, seemingly useless, rubber thingy on your camera strap is for, for those of you with SLRs!
All of the images were shot in RAW, Adobe 1998 color space, using a Canon Digital Rebel and developed in Adobe Lightroom (now in Public Beta 3). Matte and titles added in Photoshop.
This is just one of the many demonstrations I perform daily confirming my complete geekitude.
kirk