Below is another closeup of my shadow box - in use. You can see the spotlight on the left (in a regular light fixture, attached to a long, bendy arm ordered from B&H). And the real white light attached to the pvc on the upper right.
Here is a close-up of my real white light, pointing up towards the white cloth and bouncing around a bit inside my box (no direct light). I've taped it so it stays in this UP position. And I use a "north light filter" from my buddy Qiang over the light to make it even more blue, because I like the effect on my setup.
Lots of you have suggested my husband make a kit for this, but at this point he has no interest, sorry. I have suggested he make a pattern, and he may do that if I can talk him into it. I'll post about it if he does.