I found an article about some concept refrigerators that could be sold one day. The first is the Modular Refrigerator shown below.
The next is the Bio Robot Refrigerator as shown below.
The last one I thought was cool is the Collapsible, Portable, and Green Refrigerator as shown below.
layers. This allows cold air, generated at the base, to easily circulate upward through the different spaces. Very cool concept for small spaces.