I made this cake for my niece's 10th birthday. My daughters, Athena and Sophia, helped decorate since it's for their cousin. We placed stripes of blue food coloring into the icing bags. And we used a Wilton 2D tip. The white icing picks up some of the blue color to create a very pretty pattern. It's easy for kids to apply the icing. A simple squeeze and pull creates a pretty fluff of blue and white. The cake turned out looking very fluffy and I think very pretty!