Take a small piece of Ric-Rack ribbon and sew strong thread through the ribbon. Sew the thread through the back to right side of each corner.
After this pull the thread as tightly as you can. Open out the petals, sew together the two ends and stitch together in the middle.
Stitch a bead in to the center. I stitched the red lines ( red) leading in the the center of the ribbon. It holds it's shape very well.