Paint your nails with a base color and let them dry completely. Then come back and paint a layer of another color on top, and before it dries, you dab pieces of wadded up saran wrap on top lightly, then top coat THIS is awesome!!
All freehanded with a tiny detailing brush. Colors are butter LONDON Two Fingered Salute and Zoya Tru, both of which are incredible in person and you guys need them. :) http://www.dressedupnails.com/2013/01/shimmery-swirly-turquoise-purple-nails.html