You should take an accurate phone picture of the couch color and go to the paint store to look at sample colors against it. I have a Caribbean blue green with pictures from active vacations all over one wall. (White water rafting, skiing, lobstering with family) That makes it my happy place. Try to take a little time to pick the paint color because you will spend time in that room. Paint color in a room can change the whole vibe and make you want to be in there.
You can also paint 3 walls white/eggshell and have one accent wall so it isn't too dark.