I made a rail fence quilt for my SIL and since she wanted all colors I decided to create a rainbow effect on the diagonal. I didn't realize until I started putting the rows together that there are more rows diagonally than horizontally or vertically. I had to take some of the blocks apart and add more fabrics to get the effect I wanted. It turned out beautiful and my SIL loves it. It was my 4th quilt and king size.