From Tasty.

https://tasty.co/recipe/unicorn-frappuccino

This colorful copycat of the Starbucks Unicorn Frappuccino by @mymanabites brings all the fun of the original, with naturally vibrant hues from pink dragonfruit and blue spirulina. The creamy base blends vanilla ice cream, milk, and mango syrup for a sweet tropical flavor, while a tangy blue swirl made from spirulina, white chocolate, and citric acid gives it that signature pop