It is a variation on the kaleidoscope block and I am using the Kaleido-RulerTM fromMarti Michell to make the cutting easy and accurate. I put some NexCare tape on the back of the ruler to prevent it from slipping on the fabric - a technique I learned from Carrie Nelson of Schnibbles patterns fame. I highly recommend this. Here is a picture of the tape:
You can buy it in any drugstore, in the first aid section by the Band-Aids, or order from drugstore.com. A few pieces stuck on the back of your ruler prevents it from slipping while you cut, making for greater accuracy. I figure these blocks, with eight points coming together in the middle, need accuracy!
I cut enough fabric for a few blocks, to get the feel of it, and am at the chain piecing stage now. This might take a while.