I made this for a surprise birthday party for my mom. She walked by this 6 or 7 times before she realized that it was a cake and not a flower arrangement! Top tier is 6" 2-layer buttermilk devil's food cake with vanilla buttercream. Bottom cake is 10" 3-layer cake in same flavors and the entire thing is covered in chocolate hazelnut pirouette cookies. I arranged the flowers on top in styrofoam instead of sticking them in the cake so my mom was able to bring the arrangement home.