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Yes, Geri B, two squares of each color makes one pinwheel block. My squares are 2 3/8" but I think 2.5" might be just as well because my pinwheels are usually a tad under 3".
I began doing pinwheels years ago as leaders and enders because I love pinwheels but just making a 3" pinwheel quilt is a scary thought. This one is my fourth or fifth top and only third quilted one. I already have 12 nine patches completed and this time I have a 12 x 12 layout planned with no sashings, just pinwheels. 144 nine patches. I would never do that unless as a leader and ender.
my background fabrics are anything light but predominately white. I like the clear difference in the two fabrics. But really it's all about scraps!