diy version of the half moon style. I thought I'd put the two together.
All you need are some plain white sticky labels, two nail polish colors, and a top coat. First, paint your nails as you normally would with the background color. Next, cut out sticky triangles for the bottom part of the chevron, and then outline the top by overlapping two straight strips, which are little faster to cut out. This leaves the blank space for the chevron. Carefully paint on the second color, and once you're sure the polish is dry, remove the stickies and voilà!