There used to be nothing above my family room fireplace, just a yellow wall. We added the molding and painted it and the wall above the mantle white, added a silver leaf mirror and a variety of crystal vases and daisies. Much better.
See the little green desk in the bottomcorner? I found it a couple weeks ago at a consignment shop. I loved the desk, solid wood, dovetail joints, pretty carved details, but not so much the antique green paint color. Planning to paint it, but not sure what color yet. Before and after pics soon.