icing on the cake 1 Published July 18, 2016 at 4032 × 3024 in icing on the cake 1 Some of the cakes submitted to the Icing on the Cake competition at the 2016 Smithsonian Staff Picnic. (Photo courtesy Chandra Heilman) Some of the cakes submitted to the Icing on the Cake competition at the 2016 Smithsonian Staff Picnic. (Photo courtesy Chandra Heilman)