It's not really about the design though. They (Yahoo) are trying to connect with people and get them engaged.

This is similar to the "design a bracket for a jet engine in 3D" campaign that GE ran - that resulted in absolutely horrible contest entries from people who do not understand materials/stress/strain/vibration... but looking visually appealing to a non-techie. I am sure GE had no intention of even considering any of those "designs" for anything other than pure entertainment.