Pipe flowers. Prepare decorating bag with tip 104 and white icing. Using flower nail and pre-cut waxed paper squares, pipe about 20 petal flowers; transfer to waxed paper-covered board. Vary pressure to achieve flowers of various sizes.
Using Lemon Yellow icing color, ting 1/2 cup icing yellow. Prepare decorating bag with tip 8 and yellow icing. Pipe centers on flowers.
Freeze flowers until firm, about 2 to 4 hours.