Mermaid Petal Cake

• 1 tsp Gel food coloring, purple

• 1 tsp Gel food coloring, Blue

• 6 cup Powdered sugar

• 1 tsp Teal gel food coloring

• 1 box Vanilla cake mix

• 2 tsp Vanilla extract, pure

• 1 1/2 cup Butter

• 6 tbsp Heavy cream