I made my own templates so that I could vary the size of the block. However, in Fun and Done you sew the blocks together putting the batting and backing on at the same time. I am confused that you already have the blocks done with the batting on but not the backing. I suppose you could still use the method to put the blocks together but it wouldn't be the same as if it was layered while you were making the block. If you decide to make your own template, I used a vinyl tile that I cut to the size I wanted. it worked great.