Its a unique problem, but no less worthy of attention than how to dress a gallery wall or what to do when your kitchens too small. The presence of a piano in the room can be seriously demanding on decor. Here are more than a dozen rooms whove mastered it.
MMH - two sided display; no need to sheet rock some areas? -- tear out a section of wall between din/liv or kit/fam and build shelves into the studs, paint. Makes it more open, and useful at the same time!