Don't get over stressed about having " pitch black attack" in your room, just because you're putting in a projector. There are a lot of good examples on here that use some lighter colors and are very functional. Bigmouthindc's is blue and medium grey, mine is medium brown walls with espresso ceiling and light carpet with (god forbid) white trim. It works great with my projector and normal gain screen for movies.
If it's primarily TV, a lot of people tend towards a bit more ambient light in the room anyhow. My two cents is don't stress about making it a cave, and consider a higher gain screen to help keep it bright with more ambient light during a good football game with your buds.