Block 15 of the Seashore Splendor Series. This double windmill block is a fun challenge to make, but I know you are up to it! The partial seam technique is not as hard as it looks, and the rest of the piecing is as easy as sewing half square triangles. This block finishes at 12 inches and is part of the sky, so use your light blues and keep it low contrast for a great look.
See my blog post for more tips and pictures of step by step construction:Seashore Splendor Block 15