There was a time when I was very interested in vintage ukuleles. When I went to a gathering of ukulele players I wanted to take pictures of their instruments, so I built a portable photo set, especially for ukuleles!
The box had two folding doors that each contained two fluorescent light bulbs. The background is cloth stapled to a board with two holes that fit over two bolts at the top of the cabinet. That way I could change the color of the background depending on the color of the subject.
All folded up, it fits in the back of my Mini Cooper.