Here's a nice image I captured with several multi-colored orbs, which are much harder to explain with science. I have experimented extensively with capturing these and will post my findings in a soon future post. Basically I've found that they are conscious and can appear, move and dissappear whenever they like, and that they like positive energy.
http://www.freeimagehosting.net/t/81462.jpg
Click on smaller image for full size... it's worth a peek. : )