Have you guys seen magnetic nail polish? The only company that sells it in the US (so far) is Nails Inc., and while their version is cool, it is also $16. And I am cheap.
I figured out at some point before our trip that magnetic polish is widely available via drugstore (ahem, CHEMIST) brands in the UK, and so magnetic polish became subject #1 on my trip purchase wishlist.
I picked up a bottle by 17 at Boots in a black/silver shade called Gunmetal. At 6 Pounds w/ a 3 for 2 offer, I'm kicking myself for not having bought every shade they have (although I did get 2 other rad products that are in heavy rotation, so just as well I suppose). This stuff is AWESOME.
You get such a huge effect payoff for truly minimal effort. Using magnetic polish takes just a few minutes more than using regular polish . . . you lay down a base of polish without using the magnet, then on coat two you hover the magnet over each freshly painted nail for 10-15 seconds. The magnet hovering process adds 2-3 minutes to the overall manicure time, but I find this polish to be extremely quick drying, which evens things out time wise in the end.
This polish benefits quite a bit from a topcoat, which deepens the black areas of the nail and adds a ton of shine. It is best to wait as long as possible between magentizing and top-coating, in order to preserve the integrity of the design. I've been painting at night then top-coating in the morning, which has worked well.
Four gold stars, Boots 17. I can't wait for magnetic polish to become a fixture in the US!