All Custom Cakes Must Be Ordered At Least 24 Hours In Advance. Featuring three stacked layers, the Blue Cloune is one of the best sweet sixteen cake ideas! This Las Vegas bakery creation is covered with wonderful embellishments, including diamonds, flowers, and polka dots. Each sweet sixteen cake tier is covered with blue fondant and decorated in a unique and colorful manner, making it one of the cutest sweet sixteen cake designs.