Good to see the inspiration piece.
Ok, so is it one great big huge star like the ones shown, or would it start out the size of the block and then radiate out larger a few more rows? It looks to me like there are just two variations of stars, one with longer skinnier diamonds and then one with chubbier diamonds and the rest is color placement.
And the point is to have just one? I think that would be best done as a large but not huge center and then maybe some smaller related blocks separated by space and borders might work better or at least would be easier for me to design in my mind -- lol but then it would have to come out in EQ.