Here is a web site that shows you how to make the self binding blanket. I think you can do any size square or rectangle just make sure the the bigger one is 4 inches bigger on all 4 sides. I think when you make it you will think this doesn't work but it does. If I didn't cut and paste right just look up self binding blanket.
http://every-day-mom.blogspot.com/20...g-blanket.html