This awesome robot skin designed for use in the 1.8 update has a yellow visor that can be overlaid with a green one, two robotic arms on the exoskeleton, circular detailing on the front and back, and some awesome looking boots!  The base skin is pretty cool, but in the 1.8 update, the full potential of the details on this skin are fully displayed!
Check out my tutorial blog if you're looking to create a 1.8 skin of your own!