I need to improve the acoustics in an office entry. It's basic stained concrete, sheetrock walls and ceilings, a few windows and a rug at the door. No window treatments and we won't get any. The area seems to echo, or somethings off so it's hard to hear conversations.

Anyone have any acoustic panels they really like? Comments?

Most I've found online come 2'x2' or 2'x4' in solid color fabrics. I'm thinking of just getting a few square panels in basic off-white and camel color and creating a subtle pattern. Nothing loud, just varied for interest. I could do custom panels with pics of my choice but that gets expensive.