Thank you ladies!
I really didnt follow a pattern. I had some strips of 2 1/2 x 6 1/2 and sewed three strips together then took it to the cutting mat and cut diagonally from one corner to another corner. BUT I had to watch which corner I was cutting or it wouldnt have matched when I was sewing it back together again. Then I just randomly picked the cut pieces and sewed them back together.
Look at the panel...bottom right corner...see it is different? Well, that shows where I made a mistake on counting the wrong corner LOL