There's an artist on Dailypaintworks.com I've really been enjoying. I'll have to look up her name .... not enough coffee yet this morning to remember it. She paints still lifes using a shadow box that she made. I got so excited, I asked her if she would mind telling me how she did it. Then without even waiting for her answer, I grabbed a flattened cardboard box and simply spray painted the inside black (including all the flaps). I close one end, set it up on a small stool to get it to the height I want, clip a small night light from the outer flap, and viola! a shadow box! You can also do back lighting with it by simply running the light through the back flaps. I also change out between a 4 watt and a 7 watt bulb. At the hardware store I picked up an extension cord with the socket on the end. I worked perfectly. I just clip it on with a binder clip. You can hang a piece of black fabric over it too, if you want... for extra darkness.
Meanwhile, the artist I asked about it very graciously got back with me with all the details (and more great help!), and I wasn't TOO far off. Mine is just more basic, I guess. Simple minds.
Oh Yeah! This painting is of two beautiful greenish duck eggs and a brown "fancy" hen egg. The duck egg in the front was HUGE! These eggs are going to become a permanent addition to my weekly farmer's market list, for sure!