I got a 6x12 bolt of canvas from Hobby Lobby and a bottle each of gray and white acrylic paint. Those were squirted onto the canvas and then brushed together to partially but not completely mix. Semi-circular to circular strokes. I had to double over the canvas, but it worked fine. I mounted it to a 2x2 treated pole using a cordless staple gun. I still need to do a couple of things, one is add some eye hooks and picture wire so I can hang it up properly, and I think I also need to add another 2x2 near the base where it folds to go under the pot. All in all, though, it worked pretty well.
Zach