Spread white frosting onto rim of glass, several inches down. Working quickly, press sixlets candies onto frosting to adhere.

Heat white melting wafers according to package instructions. Dip pretzels and marshmallows into melted wafers. Sprinkle with teal sparkling sugar. Let set up. Put a straw through each marshmallow.

In blender, mix ice cream and small amount of milk.

Pour half of milkshake into bowls. Add a few drops of teal food coloring and mix well.

Layer white vanilla milkshake and teal milkshake into glasses.

Top with slice of white birthday cake.

Place pretzels and marshmallows standing up in shake.

Top with optional whipped cream.

Serve immediately.