Any burlap will do but I'm using these coffee bags that our bird bath came wrapped in. I'm using scrap fence boards. So far this is a free project for me and those are my favorite kind!

Molded epoxy resin reinforced with fiberglass and burlap panels The complex, located on an approximately 81,000 square-foot plot, is a visual homage to the town and region’s proud pastoral heritage.

Your walls and ceiling might look OK from a distance, but the closer you get the less appealing they'll be. That said, the solution you present is one we've seen used to solve a similar problem.