I discovered you can use just about any size 'squares' for the base and the pinwheels do not have to go from end to end of each piece. Example: Use a 6" square for the each base part and use a 4.5" square for each section of the pinwheel. The pinwheel seems to stand out more with the bigger base squares. It is fun to work with this pattern. A friend and I have made two small charity quilts and are working on more.