Large purple amethyst cake sparks wedding cake trend. Three different angles of Rachel Teufel's amethyst geode cake to show the depth of the design. Ali N Garrett Photography/Intricate Icings Cake ...

It was. Ms. Rosensteel baked an olive oil chiffon and plum jam cake, topped with burnt honey buttercream and delicate purple gomphrena blooms that measured just over 4 and a half feet — a size ...