I spent a little time a few days ago marbeling my nails. It's really fun to do & it comes out looking stellar. I love how every nail comes out looking different & it just added some spunk to my step.
I used Essie nailpolish in Marshmallow (as a base coat), Mint Candy Apple & Over the Egde:
I used this tutorial to learn how to do it. It's a bit time consuming, but so worth it (& a perfect day off thing to try):