I think I may have found a solution for the very sad wall space above our couch
I found these super affordable fretwork panels from O'verlays
They're made to paint any color you want and to be attached to anything you want
I got 2 of the 13.75" panels that I think I'm going to keep white and place over a mirror.
Now, I'm imagining what I can do with the greek key o'verlays...