Greige and its mutations — from mushroom and slate to caramel, taupe and mink — is being glossed onto lips, smoked onto eyes and slicked onto nails, sparking the stand-out beauty trend of the summer. Scarlett Johansson looked glowingly caramel-esque at the recent Iron Man premiere, Diane Kruger has been seen favouring mushroom eyes, and Gwyneth has popped up here, there and everywhere with nails just the right shade of cement.