@everyone: Thanks for humoring me! I have several different light sources that I play with. A pen/pointer light that has white and red, some child's Crayola brand lights (I really have no idea what these are typically used for!), some LEDs...whatever! Mostly, I just keep an eye out for thin-ish light sources with easy on/off switches and lots of different colors. I have no idea what I'm doing most times, actually--clearly, I haven't perfected this art, either! Maybe I'll post some past experiments on my flickr site (www.flickr.com/aikiuser) at some point soon. :-)