Which acoustic wall panels look good enough to use as part of the room design?

I've been looking into acoustic wall panels and noticed that a lot of them work well for sound control, but not all of them fit nicely into the overall look of a room. For those who have used acoustic panels in living rooms, offices, studios, or other spaces where appearance matters, which ones did you end up liking the most? Were there any styles, materials, or brands that blended in well with the décor instead of looking purely functional?