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When I saw this, it totally is a day and night kind of nail polish, you have the light(white) and the dark(grey)
What you need:
White Nail Polish
Grey/Black Nail Polish
A makeup sponge.
Apply the grey nail polish half of a side on the makeup sponge, give a good thick layer, then take the white, and cover the other half, slightly overlapping the grey.
Apply on the nail, may have to tap, and reapply to get a nice, showing payoff.
*picture belongs to link below
Source link: http://daily-pins.com/nail-night-day/