I built this recently as an entry for Frame Chef May 2013.
As you can see, it features a lot of the "secret ingredient" but, it's ugly as hell.
The twin, curving rows of spikes up the back was the initial design choice and the driving one behind the build. This was my first mistake. I fought to get everything else to fit around this section of parts. I wanted something spiky, to make it look like some sort of mechanical hedgehog. This just goes to show that just because you want to have a certain part or parts in a frame design, doesn't mean you should. The legs were mostly an afterthought. Except for the feet which were chosen to make sure the frame didn't tip over. Although I may use this design along with the hip connection again. So, think of this as an example of "how not to".
If you want to check out more angles, here's the Brickshelf gallery.
Mobile Frame Hangar discussion topic.
Toys'n'Bricks discussion thread.