I like that a lot. There are 2 ways that I see, however, to do it without set in seams. One is to topstitch the flower centers in place after the rest is done. The other is to make the block in 2 halves, with half of the center (plus seam allowance, of course) in each half. I would have made it exactly as you did, if I had thought of it.
Very good job!!!!!!