What to put on your nails this holiday season? Forget the red, go gray.

When we discovered the black lipstick and nail polish trend, we balked. But two months later, half the moms in the office are sportin' the look. Up next: Gray. The London runways were full of the trend, and it's a nice welcome from the dark blues.

OPI director Suzi Weiss-Fischmann even calls the trend "classic and versatile." Careful of the tint though, some grays may make your hands look older. Play with different colors before committing.