Video: Using Reflectors for Macro Shots
Here's a short little video clip that demonstrates how easy it is to use reflectors to flesh out a macro shot.
Main point: They are lighting from the back/top, with a top/backlight-based exposure. So they use the reflectors to basically do everything else, except the additional background light.
This video is a demo for a commercial product (the reflector system.) But I think, with some deviously clever engineering, it just might actually be possible to DIY these things out of cardboard, posterboard, aluminum foil, a guy wearing a white T-shirt - whatever.
Call me ambitious, but I think it could be done.
If you shoot (or find) a cool lighting-related video on YouTube, please suggest it through the link at the top of the Video Archive dropdown menu on the sidebar at right.