Make the following color flow pieces at least 1 week in advance: 13 hearts, 20 rose flowers, 30 white flowers, two bells and four ribbons. Outline patterns using tip 2 and full-strength color flow. Let dry, then flow-in with thinned color flow. Let dry.
When completely dry, use full-strength color flow and tip 1 overpipe bell and tip 2 to pipe swirls on flowers. Make extras of all color flow pieces to allow for breakage.
Bake and cool two 1 1/2 in. cakes to form one 3 in. high cake. Prepare for rolled fondant by lightly icing with buttercream. Cover cake with fondant; smooth with Easy-Glide Smoothers.
Pipe tip 21 shell bottom border. Attach color flow pieces with dots of icing. Mark message using pattern and toothpick; write tip 4 message.