I've been dying to try the fan brush technique. When I bought my first set of brushes I did not have a clue what it was meant for...and probably still don't.
During my hiatus I still checked out blogs and noticed this done a couple times. This was my first attempt and I'm pretty happy with how it turned out. I probably used 5 different blue polishes and one white to complete this look. When I put on the top coat it almost created a water colour look.
Very easy peasy. Just dip the brush in the polish and swipe across the nail.
I'm planning on doing this again soon. Maybe with a little crazier colours.