Birthday Suit is a sheer layering polish that will turn a darker color multichrome. I first swatched it on it's own, 3 coats. If you like a semi transparent color then this may float your boat. Personally, I dislike visible nail line so I then layered it over black.
Heartless is another fabulously densely packed glitter in Magenta, Black with tiny holographic sparkles. Two coats were needed for opacity.