Did you think about printing one? Of course laying out the pattern on the computer is no piece of cake either.
I would either make it in clay and cast it, or lay down a surface you could score (joint compound?) Measure off the concentric courses with a ruler from the center and then score them with dividers or a compass (or make a trammel) with one point on the center. Then put a pin in the center and holding a ruler against it at one end, score the grout lines between the bricks in a radiating pattern. You could measure these or carefully do it by eye.
Careful paint the top only (bricks) stain the grout and voila!
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