There are a number of Dresden Plate rulers on the market. The number of blades per plate is determined by the angle of the blade.
Go to YouTube (
http://www.youtube.com) and search for "dresden plate" and you will find videos describing how to use many different rulers and ideas for Dresden Plate blocks.
Linda Franz has Inklingo collections for both applique AND pieced Dresden Plate blocks. She even has a little book with oodles of ideas for different styles of Dresden Plate blocks.
http://www.inklingo.com/shop/dresden-plate-quilt/19
If you click on the various collections, you will see more detailed information on the shapes and design possibilities. I am not affiliated with this product, but I am saving up my pennies to get one of these collections :-).