I'm loving that magnetic polishes are so becoming mainstream! I think it's a fun way to do some interesting nail art without requiring too much work.
There is definitely a learning curve with these polishes but once you figure them out, they're very easy to use.
Here is China Glaze Magnetix Attraction
China Glaze sells their magnet separately from their polishes. I personally like this idea that way you're not only limited to the magnet on the cap. The designs are a star, chevron, and diagonal lines (The one I used).
I haven't tried the chevron pattern yet but the star and the diagonal lines both work very well.