It's a bit late for this post, since new Essence collection is already in stores, but never the less:
Essence Metallics collection: Iron Goddess.
I find this polish perfect since it's a manicure in only one layer, done in about 5 minutes, and classy enough to go anywhere. Of course, that's after you find the perfect magnet. The one that Essence sells is wasted money, since it's too weak to make the pattern. I tried with every single magnet from my fridge, and some of them were quite good. This one on the photos is my favourite. It leaves only two or tree large stripes depend on how long the nail is and when done gives the feeling of 3D on the nail.
I bought Iron Goddess and Nothing else metals and love them both!