SideBox is a self-assembled, modular box-style shelf that can be installed on a cubicle divider. Its completely made of corrugated cardboard (one of my favouraite materials), and can be laser-cut to assembled in a matter of 5 minutes. So far I've found them pretty useful as general scratch space, eg pens, headphones, post-it stacks, etc.
-Uses a simplified hook held in place by locking rectangular pieces.
-The top edge of the side walls is a circular arc, just for aesthetics mainly
-There is an arc on the top edge of the front wall, again just for aesthetics
-Uses a notch in the hook, design that prevents the box from coming off the hook.
The two together. Version 0.2, does look like a face!