I can't remember where I saw a picture of a beautiful glitter gradient manicure, but it stuck to my mind. I made my own version using Spindleweb by Femme Fatale. It's a polish with a petrol blueish sheer base and lots of turquoise and green glitter in various sizes.
I first put a neutral skintone polish on my nails, then added a few coats of Spindleweb with each layer ending closer to the tip than the previous, then finished with a fast drying top coat. An easy look and quite fast to do!