If I ever get to build a home theater room without restrictions; it won't be rectangular. It'll be more like the Axiom speaker enclosures. With the floor and ceiling sloping away from each other, along with the side walls. The front wall will be an arc.
No parallel surfaces.
When we built our media room, we ended up having a broken ceiling and wall pattern such that we actually have a partly angled back wall and a similar wall section to the right hand side of the chairs in the upper ceiling corner.
The left side of the room was tempered with heavy curtains in front of the doors.
I've always thought the room had excellent sound, the best i've heard so far in comparison to others or other rooms in my present and past homes, but i have yet to setup and take measurements during a sweep. It might still be a bit bass heavy.
The room dimensions were originally put together with the Golden Ratio in mind.
http://www.cinemasource.com/articles/room_modes/modes.html
