With only three days left until Halloween, we're sure you've chosen a fabulous costume! Now it's time to add the chic little details that really bring it home. Enter Sephora for OPI's new Full Moon Nail Colour, a white nail polish (like Kimora's) that actually glows in the dark. We've tried it, and the effect is truly spook-tastic. When the lights go down, the milky hue casts a witchy, luminescent glow that makes your outfit. So sinister-sexy! Sephora for OPI Full Moon Nail Colour, $9, sephora.com Here's what you had to say: Rona commented via Facebook: "I love OPI polish. I'm wearing a black and gray glittery polish by OPI for Halloween." Rona wrote via Facebook: "Our daughter was just asking about this product"