Make flowers at least one week in advance. Use carnation cutters and directions from Floral Collection Flower Making Set to make the following gum paste flowers: 30 large roses, 60 medium roses, 14 small roses, 150 stephanotis. To make flowers, mix gum paste 1 can at a time as needed. Make 30 bases for large roses (7/8 in. wide x 1 in. high), 60 bases for medium roses (3/4 in. wide x 7/8 in. high) and 14 bases for small roses (1/2 in. wide x 3/4 in. high). Let dry overnight.
For large roses, use large carnation cutters to cut petals. Assemble following roses directions on page 16 of set instruction booklet. (Hint: Make roses, one layer at a time, and let dry overnight. Wrap strip of tissue around petals to keep in position. Place on cookie sheet to dry.) Use small carnation cutter and follow same process for medium and small roses.
For stephanotis, follow instructions on page 34 of set booklet, steps 1-6 only. Use stephanotis cutter and toothpicks instead of wire. Let dry.
Bake and cool 2-layer cakes. For 18 in. cake, you will need to bake four half layers, each 2 in. deep, to make a 4 in. high cake.