Wow! That is quite an undertaking, very pretty, so far don't know how to do paper piecing.
I guess I was thinking that you'd cut out the whole petal one by one, then stitch it flat arranged like a poinsettia to any shaped block you wanted.
Maybe, I'm imagining more than can be achieved.
I was looking for a pattern for the petals that were 4-5" petals and maybe some pattern for leaves then arrange them as a poinsettia and stitch them flat. I guess you'd have to do what she did and make a back and front otherwise it would be a raw seam.