I would put like blocks together or even like colors together. Just lay them out until as large as you want and add borders to blocks so they fit together. I taught classes for years and later divided my left over blocks in light and dark pile and put them all together. My dark quilt I made the lining out of scraps that were 45" wide but from 8 to 16" long. The quilt finished 45" by 60" and it was the first one I sold when I decided to sell some. I thought it was the uglist one I had ever made.