It's a real drink. Available for a limited time only.
http://www.today.com/food/starbucks-unicorn-frappuccino-t110477?cid=sm_npd_td_fb_fd
COMING SOON! The Unicorn Frappuccino.. The magical debut happens on April 19th.
[FONT=proxima_nova]The base is a crème Frappuccino with mango syrup that's mixed with a sweet pink powder. Then it's layered with a sour blue powder topping. The finishing touches are vanilla whipped cream and a sprinkle of sweet pink and sour blue topping.[/FONT]
http://www.today.com/food/starbucks-unicorn-frappuccino-t110477?cid=sm_npd_td_fb_fd