Wilton Cake Decorating demonstrates how to make and decorate a heart fireworks tiered cake. Roll out the pliable edible cake clay so that it is about 1/4 of an inch thick. Cut out heart shapes with cookie cutters. Let them dry for a few hours. Attach the hard hearts to wire with an icing adhesive. Create a bouquet out of the candy flowers by crooking the end of the wires and sealing the bases with floral tape. Create three-inch panels for the six-inch cake out of the cake clay. Cut out heart shapes from the middle of the panel. Decorate the panels with clay circles for an added dimension. Work with the panels while they are soft. Apply the panel to the exterior of the cake's buttercream frosting to complete the look.