That looks like wallpaper to me. Perhaps it's a grasscloth or other natural fiber material. Here are a few similar examples that I found on the Houzz Products section and around the web.





http://www.phillipjeffries.com/

www.americanhomeintl.com has a great selection of these grasscloth wallcoverings - from Phillip Jeffries and other "to the trade only" manufacturers...very reasonably priced...