let me show you a lovely new nailpolish I just bought:
OPI's SKI TEAL WE DROPTechnically it's been out for a while, it's part of the Swiss collection, but you can still get it online and in some stores.
The color changes from a dark teal to a brighter bluer shade when in the light, both hues are gorgeous :)
The polish is basically opaque with one coat but I added a second one to be sure. It's a thin polish that applies smoothly and holds up well, like all OPI polishes I've had so far :)