SFGate

Darzy I think I'd "mood" up the room and paint the end walls a navy blue, and just the lower part of the angled walls the blue also. The carpet color and wall color is not complementary and the blue will contrast nicely with the rug. Then a fun area rug and reupholster the chairs in a fresh fabric. I'd also remove the clock above the prints to above the game console on the lower part of the angled wall. This will "hide" the cord.

Linda Enzor I like the idea. I wonder if the black couch and navy walls would be clash.

ARANY WOOD FLOORS how about some wood floors ?

Architectural Elements Add some trim and maybe a chair rail and some framed wall panels below the rail. You could also build a niche or a built in case into the attic space behind for the flat screen and the electronics. This would maximize the floor space.

Darzy Hi linda, The black couch looks more like a charcoal gray to me. No, I don't think it would clash. I would add some contrasting pillows for pattern and punch to break up the "dark" area. I'm not keen on the idea of chair rails since there are so many angles and "lines" already. An updated ceiling fan would punch up the style too. I was thinking a 3 blade stainless fan, but this one here is quite "neat" for the boys space.

lulamarie I agree with Darzy's suggestions. Also, if your kids are all teenagers, consider how you will want to use the space when they leave home.