I had a big bare spot between two windows in my family room. I went to Home Depot and purchased a packaged door frame kit which is much cheaper than buying framing at 2 or 3 dollars per foot.
I took the door frame and mitered the wood to make a picture frame. I then nailed and glued the picture frame to the bare wall, painted the wall red and left the picture frame antique white and then hung my wall art inside the new permanent frame.