Tom,

the walls and ceiling are in different shades from almost black (wall behind the screen) to 2 different shades of grey.

I forgot to give the specs of the setup:

Speakers:
DSP7200 fronts
DSP5200 rears
DSP5200C center
SW5500 sub

A/V Processor
861v8 reference surround processor
HD621 HDMI processor

Blu-ray
Oppo BD93 3D Blu-ray player

Projection
Stewart Studiotek 130 10' (3 m) wide screen
JVC RS50 Full HD 3D projector

Music streamer
Control:15

Cables
Meridian SpeakerLink
Audioquest HDMI cables

Paul

861v8, DSP7200, DSP5200HC, DSP5200, SW5500, Panasonic UHD UB9000, JVC DLA-NZ7, Arcam PA410, P429, KEF R8 Meta