While ColourPop's lead cosmetic chemist says the formula took some serious perfecting (almost a year of tinkering), it's gone unchanged since the launch. In the factory, we followed the best-selling shade Nillionaire , a limited-edition hue from last summer's collection that, due to popular demand, was just added to the full-time roster. (The name, as you might assume, means you act like you're a millionaire and you really have nada — but you still got the $5 to buy the shadow.)