The Good, The Bad, and the Ugly

The Good:
http://www.instructables.com/id/Simple-Walker-Robot/
http://www.instructables.com/id/Playful-Puppy-Robot/
-Simple design and layout allows for easy modding and changes to the physical design
I personally plan to scale up the concept of the Puppybot, should funds allow, while adding the ability to walk on its own and avoid obstacles like the simple walker robot.

The Bad *but it's so cool*
http://www.instructables.com/id/EZ-Robot-Controlled-Lost-in-Space-B9-Robot/
http://www.instructables.com/id/chicken-walking-robot/

The Ugly:
http://www.instructables.com/id/Ugly-Duckling-Robot/