Cult Nails has a new(ish) limited edition collection out called Deceptive. Deceptive features five new color-shifting top coats.
These top coats are all kind of awesome because you can get so many different looks from just one bottle, depending on the base color. For simple purposes, I showed them all over Cult Nails Nevermore, which is an excellent jet black creme (not included in the set of five).
For all of these swatches I used just two coats of Nevermore and one coat of the top coat.