In this case, the cake itself is not marbled, the icing is. I came up with this marble technique when decorating a cake for a silver anniversary. I started mixing white and black fondant while pondering how to give the cake a silver appearance. I soon noticed the marble effect, stopped mixing and rolled out the fondant. I found it gave the cake an elegant look. Since then I’ve made the marble decoration with lots of different colors and more or less blending.