Here is a soft cover instruction book for curved piecing titled... Spinning Pinwheel Quilts: Curved Piecing Using the 3-6-9 Design System By Sara Moe - Krause Publications (2007) - Paperback - 128 pages - ISBN 0896895599
Includes bonus CD with appliqué templates, embroidery designs and assembly charts Spinning Pinwheel Quilts delivers a fun, fast, pinless and foolproof approach for creating unlimited quilt designs with just a few simple blocks. Using the author's own 3-6-9 System and design kit for creating shapes and designs with similar colors and fabrics, you will discover endless quilt design possibilities. The 11 detailed chapters in this book explain how to use the 3-6-9 System to combine the Spinning Pinwheel and non-curved blocks to create spectacular design.