I was with a few friends tonight, and we were starting to get really creative with our ideas. One friend suggested that we try posing him in a "scared" position, fire the flash, and then have another person step into the frame. We then drew lines all over BEHIND the second subject, outlining him like an ominous ghost. Here's the result:
click to enlarge, or see it on Flickr
This image has been rather heavily processed (darkened a bit, lowered the contrast, and removed most of the color). Pretty cool. An interesting lesson I learned from this is that even something you would think was a mistake can make a shot better. In the last two seconds or so of exposure, someone opened the door (to the left and behind), letting in light from the outside. I thought this would wash out the shot, but it only gave a little light to my background and subject, and cast a better shadow of the second subject.
The second subject had a great light-painting idea on our way out of the building. I won't tell you what, but when we take the image, I'll be sure to do a post about it. If we bring it off, it will be awesome in epic proportions.
Go out there and start painting! Link to your good images in the comments.