Recently as part of the Oxford Flickr group, we met up and took some photos know as Light Graffiti.
Since they have been posted, I've had a few emails asking how's it's done, so I thought I'd expand on my replies here.
First up, things you need. A camera that can do long exposures. I've got a Canon 350d which allows up to 30 second exposures. A tripod, nothing specially about this. And optionally a remote.
Now for the lights. We had glow sticks, torches and sparklers. You can use any kind of light, and if you have different colours, you can make it more varied.
For the above picture, we used a 30 second exposure. One person stood in front of the camera, just a couple of movements of a heart, turned the light off, moved over and did it again, and then again.
And then again for this one, spelling out Oxford. but also with lights behind it, doing circles motions, like the Flickr logo ;)
For this shot, our lovely assistant Anna, ran around with a sparkler. If you look closely at it you can see the sparks comes off the trail.
This one was the last shot of the evening, we pointed all the remaining cameras at the wall, and everyone ran in with whatever lights and just went crazy. I think it worked out well ;)
And for this final picture, our model Pete stood still for 30 seconds, while Al traced a torch around him.
You can find more pictures from our meetup over on Flickr.