I like to make a few extra quilt blocks (normally enough to do one row) just in case I mess something up while putting them together or whatever. Well knock on wood I have never had to use them in my tops, so I use regular farbic and the quilt blocks to piece the backs. I usually have a whole row of blocks across the back and then 45" fabric on both top and bottom of the row. It is normally cheaper than buying wider fabric and it looks like I wanted the seams there! Oh and there is no trying to match prints!