Dunham went for an almost baby-blue shade at the premiere of Dom Hemingway.
And Barrymore opted for a brighter shade called Thistle or That from her own Flower Beauty line at CinemaCon:
Which photographed very blue here, but is actually softer and more minty in real life (see here).
And so it is decided: Blue-green is the nail color of the week. Makes me want to reach for my old fave, Essie's Turquoise & Caicos and go to town. How 'bout you?