>>5497869One long posterboard curved into a giant "C" shape so it becomes a bottom to top piece with no seams. Side facing magnets on all corners.
Two side pieces with 2 magnets, one to link to the top and another to link to the bottom.
My camera allows me to angle the flash, so I angle it straight upwards. Light hits the ceiling, diffusing off the white top and bouncing all through the box creating an even "coat" of white light.
A daylight-temperature light diffused to the top or sides from a lamp or lamps would create a similar effect.
Easy quick fix apps like Google's Picasa can help fix colors and white balance for a final shot.