Books work well enough...so do a stack of records. So many functional ways to use traditional decor to accommodate acoustic benefits. For example I have no highly reflective surfaces in my living room except a 60" monitor on the side wall. I cover it with a wool throw blanket when listening. No picture frames with glass. All artwork is canvas or wood carvings. It's not perfect...but it looks like a living room and it works well enough to get some imaging and focus.
