I really love this one. I love a plain brown paper bag. There's something about the way other colors look with it. I have a giant roll of craft paper that I use for all sorts of things. It lives in my studio on top of my counter.
It's awkward and heavy, but so worth the struggle.
Did you ever cover your books with a brown paper bag? I wonder if people still do that? I hope so. That feeling of trying to get the book's back cover snuggly into the new paper cover... it's a good one. If you do it right, it will last all year.