I do these all the time on wall hangings. I just take about a 5" square fold in half, put the raw edges with raw edges before sewing on binding. Then put on binding, wahlah. I sometimes put one in each corner as I am not sure which is up down or sideways hanging. I use a dowel that fits snugly between the corners and hang it up with a nail. This works great on smaller ones. If the hanging is as long as a dowel I will put a loop in the center area to support that area. All this because I don't know how to do a sleeve. :)