Don't buy the rulers!!!!! Sellers are in the business of selling their stuff. They say that they are REQUIRED so you will buy them, but you can figure this out with a couple of test blocks. Get the pattern if you like - or get one off of the internet. I'm sure there must be one available. Or draw it out on graph paper yourself. The pattern is the same pattern it's been forever. It's the colors that you adore. Copying someone else's colors show that you appreciate their color sense. There is no copyright on that. You will be proud of yourself for doing so. And saving some $$$ for fabric!