Our Rainbow Surprise Cake pure FUN!! Wow your guests with five delicious layers of Madagascar vanilla cake with alternating layers of rainbow buttercream. The outside of the cake is frosted smooth with Madagascar vanilla buttercream and coated with rainbow sprinkles. The real fun begins when you slice into this cake and experience an explosion (well almost) of sprinkles! Of course the cherry on top is that there are cherries on top! Now that’s Fun!