GM, not normally known for taking risks or building quirky vehicles, has gone and done it: they have just announced the Chevy HHR Panel edition, which is an HHR with no rear seats, no windows or doorhandles on the rear doors, and a flat load floor with tie-downs and storage bins.
Jalopnik has a nice photo gallery.
Besides being a nice fleet vehicle for small businesses, and a perfect platform for advertising, this HHR has a definite utilitarian cool factor to it. You can expect this car to be a platform for all kinds of customization at SEMA--surfing, woody edition, extreme audio. How about a micro-hearse edition?
GM should offer mountain bike mounting hardware for the cargo floor.