I printed off the pattern suggested and it uses 10" squares. Each row is 10 inches. The one you like seems to have varying widths. You could make the rows 6 , 7, 8, 9, 10 inches with and 2 or 3 inch plain between and get 65 o 70 inches and add plain wide borders top and bottom and get a suitable length. Just use the random pattern for placement of colors. I hope you get a pattern you like.