1. Gandalf as the Drill Instructor from Full Metal Jacket, possible inclusion of hobbit on assault course apparatus thing or standing on a locker. This is vaguely the current front runner.
2. Hobbits at war; flag raising Iwo Jima pose (which may be a hobbit too far)
I had a vague idea about Ringwraiths in a Panzer tank as well, nothing like literal thinking

Views welcomed.