"Plexi Cube"

This one is cool, I can't take credit for the design though(saw it somewhere on the web).

It is made from a solid piece of 1" square plexiglass. All six sides have a 3/4 diameter circle milled into them so that it becomes two pieces with the center captivated by the outer square.

I also modified one of my "Cubes" to make a neat little stand for it. None available I only made this one.