Appoint thine walls and table/other furnishing tops with painting, prints, photographs, sculptures, etc., which pleaseth thine eyes.
Really, this is not rocket science. Art hanging on walls isn;t gonna hurt yer 'sound waves" but it might hamper your aesthetic if it doesn't jive with your mind. In the room where I mostly listen to art hang four paintings, a couple of them rather large-ish, and a piece of "tramp art' sculpture atop a buffet side-board. The music doesn't seem to mind.
P.S. But I ogtta admit a "black velet Elvis" somewhere @ the maison would be cool.
P.P.S. But given my location, I'm probably more likely to find a "black velvet Johnny Hallday".