This is the lightbox that K set up for me. It's pretty simple but it works really well and it doubles as storage for everything that I use with it. He picked up a Rubbermaid type tote at the Dollar store, two brooding lights, and some tagboard. He cut the tagboard to size so it just fits from top to bottom (it curves in twoards the back of the tote). The only thing he really had to 'build" are the stands for the lights. He is still working on those, he said he wants to be able to adjust the height of the lights as well.
We went to our friend's quilt shop in town and bought a bunch of fabrics to use as backdrops and bought some other ones when we went to Wal Mart. I posted a picture of the fabrics earlier in the week. The tagboard can be used as a backdrop itself(keeps you from being able to see whatever is behind your lightbox) and also helps to hold the fabric that is being used as a backdrop.
We chose a frosted plastic because it helps to diffuse the light a little more, it's not such a direct light only look.
Pretty simple and cheap and more sturdy than a few ideas that he found out there. I like it, I've gotten some macro shots that I really like using it and I'm still thinking of new ideas to try!