I must have for sure...
A COOL Sephora Magnetic Manicure!
This is one of the most fun stocking stuffers we've seen yet. You paint your nails with this magnetic polish by Nails Inc, London, sold at Sephora, retailing for $16 each. The lacquer contains metallic bits, and right after you apply your 2nd coat, you hold the top of the bottle, which contains a magnet, over the nail for several seconds, and it draws the metal bits into a cool design. The colors (chrome, teal, or purple) are edgy, and it is fun in a nerdy Museum of Hands-On-Science kind of way!
See the Demo Below