There are many DIY photo cube tutorials on the internet and I'm adding one more now.
For this photo cube, you can use any size box that fits your needs. The one in my example below was made out of a necessity to fit into a particular space (12 inches wide).
I hate having to set-up and tear-down my photography arrangement based on what I'm doing each day. Wouldn't it be nice to just have a little corner space set up at all times for when I want to shoot a picture?