I wasn't particularly impressed with the Katy Perry collection OPI released earlier this year (or was it end of last year? I can't remember!).
Last Friday Night is the only one I have picked up - at least so far. It may not look like much in the bottle - just your typical jelly base with glitter floating around - but I love it on the nail!
Here I have layered it in a gradient over Barry M's Cyan Blue, with the first coat covering about 2/3 of the nails, and the second coat just on the tips.
Cyan Blue is a lovely bright blue crème that covers in two coats. The Barry M polishes do tend to thicken up, but it's nothing a few drops of thinner can't solve.
All pictures are taken in natural daylight.