We love using Kurumi buttons.
They can be used for the center of flowers; the center of dresden plates, just by themselves,
and don't forget our favorite, the Macaron. Be sure to check Heart to Hand Hidden Treasures patterns https://www.hearttohand.com/ and Susan-Claire Mayfield's (The Gourmet Quilter) clever use of Kurumi Buttons https://www.gourmetquilter.com/.
Have used in appliqué and the extra dimension they add to piece is outstanding.
Have not received it yet. Has it shipped?