I use them as the fronts of cars, some times.
@DTinagliaStudios, I could see it as the chair on a vehicle,, if it was flipped on the stomach.
I would say this, probably:
This actually the best picture that I could find without knowing the parts official name, but I mean the big, black technic blob at the bottom, right by the tan technic lift arm. The lime piece by the rahkshi back isn't very useful, either.