Without seeing it nor the colour on your walls (which also plays a part), I would say you could take any one of the colours from your carpet as your colour for the upholstery. Yes you can choose two complementary colours for your upholstery but make sure they work tonally. (To do this take a picture of the colours and render them black and white; the colours for your upholstery - even if they are different - should have the same level of grey in the b&w photo).

There is contrast between the traditional furniture and the focal point of the floor which pops, draws attention. I would recover the sofas in cream colored soft fabric - suede. I would leave the curtains grey, and put down a large neutral area rug. The edges of the room would show the pattern of the floor. I would color the wall and add texture to it, but not too dark as the room will appear smaller. Add a picture and put a nice plant holder, large vase in the left corner of the room - an oriental-style vase. Or, a cream-stripe fabric on the sofas. You could go soft or bold in this room - depending on your taste.

I personally think a black and white room is sharp and provides a unique look. I understand if you want some color on the walls so I attached some other spaces with paint colors you may like. The cool blue is great with black and white as is a cement colored gray.

Where is the other window placed and what is its geographical direction?