The Wanderer
At the core of The Wanderer is a wizened figure, whose body, except an arm, has been consumed by a coating of mechanical parts. In terms of contrasting the natural with the artificial, this is the most effective junkmech. It is also the one I constructed most recently, and I think the extra experience is visible. The entire body is so dense with detail that I recommend really examining the images, and I am especially proud of the part usage and the intentionally messy color scheme. Also, note how the hat is attached to a stem that slopes over the figure's head; that particular molded head piece has no studs.