I make them for the kids at church as they graduate. I have a 15" square and I make them all the same size. I use fusible interfacing on the back of each. I use fleece for the backing, so I don't need any batting. I usually do a zigzag or serpentine stitch over the ditches. I get them done pretty quickly. It seems you would want it done quickly so he can enjoy it while he can still see it.