I've had five sofas in the past nine years but I don't have a sofa right now. To be honest I'm not much of a sofa sitter - I sit on the floor. I've also lived in small 620 sq ft apartments for the past nine years where living room, dining room and work area usually mold into one.
So, if I sat on a sofa and had a living room I'd be inclined to put together a room something along the lines of these ten from the 70s. Numbers 1, 7 and 9 are my favourites. My husband likes number 10.