Homemade Lightbox

I used velcro over the openings so I could remove or swap out the cloth on the side easily. There's also velcro holding the posterboard backing in place, so in theory I can replace it with other backings (like black posterboard or assorted cloth pattern fabrics, as I intend to do at some point).

 

At some point, I'll also want to get some clear acetate or cellophane that I can velcro on the side as cheap-o colored light filters.

Done