Fat quarters are not crumbs. My scrap quilts are made from small pieces left over from other quilts or garment sewing. I have been saving these crumbs for years. I sew together the two smallest ones I can see . Trim one side of these two to add another piece. When the piece gets larger, make strips by sewing little pieces together. I use anything that is at least 1/2 inch wide as I make 1/8 in. seams.