Here is a round box that I made. It has a mechanical iris on the top, so you can open just the middle part if you want.
I wanted to make something that was not “square”. It has 64 sides, and each side is 2 layers. It was really difficult to put together. I had to cut extra pieces to hold things in place while I glued them.
You can see more of my stuff at: http://polarbrainfreezethecut.blogspot.ca/