Whether the plates you registered for have a classic border or a more modern, organic feel—like this whimsical set by Tord Boontje—their design can translate beautifully onto a round tiered cake. In this case, N.Y.C. baker Kate Sullivan hand-painted Boontje's motif on fondant using a mix of lemon extract and powdered red food coloring. She made the animals' eyes and the blossoms' centers with dots of royal icing.