The instructions for the Double Pinwheel block actually make 2 blocks that have a different look. Choose which one you like best or use both. This method actually makes a 6¼ finished block, so you will have to trim it to fit the 6" sampler quilt.
Double Pinwheel Quarter instructions
Double Pinwheel Finishing instructionsUsing 4 alike quarters, sew together forming a pinwheel in the center using a ¼ inch seam. Press seams to one side. Makes 2 blocks total.
You can use the Double Pinwheel calculator to make your own project.