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This holographic look is the result of iron fillings in the nail polish being moved by a magnet while the polish is drying. No complicated kit is necessary. All you need is the nail polish and the magnet which is usually included with the polish.
There are several brands that offer magnetic nail polish colors. We picked up Sally Hansens Magnetic Nail Polish for $9.99 at our local drug store.
Sally Hansens line comes in a range of 8 beautiful colors: Ionic Indigo, Red-y Response, Kinetic Copper, Silver Elements, Golden Conduct, Electric Emerald, Graphite Gravity, Polar Purple.