It's called Lemoyne star. One easy way is to use HST's (half square
triangles). Here's a tutorial. If you want a 12 inch block you make your
HST's 3" finished (3.5" unfinished). If you need more info. tomorrow I can
help you. Now I'm off to bed. :)
http://roundtheblocks.blogspot.com/2...oyne-star.html