I've been throwing around the idea for a photo project in my mind. A long time ago, I took this picture:

The effect is pretty simple: set the camera to take a picture for 30 seconds, and then get a small piece of light (in this case, I used the tip of a stick from our campfire) and wave it around. 

The idea I have is take a photo subject, and use long shutter speeds (with the lighting effect above) to create image of  angels on earth.

The first photograph I'd try to tackle would have to be done in a completely dark location - I would illuminate the subject from behind (thus allowing the outline to be visible, while washing out all front features). (Imagine that scene from the Crow)

Over the 30-second period, I'd take a small white LED light and draw the outlines of wings around the figure.

The idea could be extended: once I get a handle on how the Rebel handles long-exposures better (if you noticed, the pictures I've been messing with are all long-exposures), I might be able to actually get these sets done in real life, outside. Imagine somebody reaching out with a helping hand on the street, with their wings barely visible (I'd have to stack multiple ND filters to achieve that effect, though).

And yes, I realize this could all be done with Photoshop, but that really defeats the point. The end doesn't justify the means for photography, for me. In any case, I try really hard not to do any manipulation in Photoshop afterwards (that's a post in itself). 

Wish I had a body double - unfortunately these pictures require more than just myself :/

. . .

Edit: Of course, all good ideas have been done on Flickr. My idea is very similar to this picture, with the exception that I'd be even more aggressive with backlighting (to completely wash out the figure's front) and I wouldn't make the wings seem so ... classical. (And I'd drop the halo).