1. Create three different batches of buttercream frosting: one pink using Red Red Premium Gel Color, one teal using Teal Green Premium Gel Color and one light blue using Royal Blue Premium Gel Color. Pipe each color in sections on the side of the cake and smooth them out, trying not to mix the colors too much. After the frosting is smooth, use a spatula to create lines in the buttercream.
2. Place a teal happy birthday banner on the top of the cake.
3. Finish by sprinkling pastel quins on top of the cake.
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Decorating idea by Bonnie Lee, courtesy of Lucks