"Small flash gear is especially well suited for shooting macro shots and other small-object still life and product shots," says David on his Strobist blog. "And this little studio in a box does not even technically need a flash to work its wonders. Any bright lamp will do if you are shooting digital, because it is very easy to balance for tungsten light and get the color balance spot on."
"This is basically a light tent, albeit a very controllable one. It pretty much creates beautiful light be default. Frankly, it's very difficult to get it wrong. This is one of the most useful DIY gadgets you could make - especially when you consider the single-digit price tag."
You can find out all the details by reading, How To: DIY $10 Macro Photo Studio.