Whirlwind is one of the two shades of nail lacquer from MAC's Blue Storm collection. The website describes Whirlwind as "metallic royal blue with green, blue and purple pearl" in a frost finish. This could very well be true, but that's one confusing description if anything. Looking at my nails, all I can see is dark metallic blue-green. I love the colour, which goes incredibly well with my skin tone, and in the off chance that the prayer whispered into the internet abyss will be heard by Roland Mouret, I would love a Galaxy dress in this hue.