I used a fabric called osnaburg (bought at JoAnn's). It has the rustic look of burlap but it has a tighter weave which allows for nice stenciling. Sort of holiday looking but easily stays on through winter.
I used some stencil sheets from Martha Stewart. DO NOT, I repeat DO NOT buy these things. I had a miserable time using this product. I usually like her stuff but this is just trash. Didn't anyone test this stuff out????? It comes rolled on a tube and curls mercilessly. It would not lay flat no matter what I did. I curled it the opposite way, heated it, flattened it under a stack of books for three days and it still returned to the curled state. There are other stencil sheets out there so try one of those if you want to make your own. The fun part was that I used a digital cutting file called FROSTED (SNOW) FLAKES from THE DIGI CHICK to make the stencil with my cricut.. I had to cut it twice but it worked perfectly.
I wanted to put a few more snowflakes closer together but the bloody stencil was such a pain that it ended up here....
I cut two sides of the osnaburg and put them together with right sides together and stitched around the edges trimming the corners.
Flipped it right side out, pressed the edges and that's it!