To start, add a couple of small drops of black gel food coloring into your white fondant and knead until tinted. The fondant should come out light grey.
Divide the fondant into one dozen spheres, about ½ an inch in size.
To form each shark fin, slightly flatten each sphere and press the top to a point. It should look like a triangle.
Curve the tip of the fondant triangle to give it a more realistic shape.
In a large bowl, mix together butter, icing sugar and milk with an electric mixer. Start on slow speed and increase to high.
Once ingredients are well-combined, add royal blue gel food coloring. Beat until completely tinted.
Scoop buttercream into a piping bag with Wilton tip 1M attached.
Frost each cupcake.
Using the blue gel frosting, decorated each frosted cupcake with “squiggle” lines.
Insert a toothpick at the bottom of each fondant shark fin.
Insert one fondant shark fin into each cupcake.
Serve and enjoy!