I first applied a Sally Hansen base coat, once that was dry I applied a white crackle polish from Avon and let that dry completely. Then I used 6 different colors to make a 'rainbow' of colors on my nails over the crackle. I had around 25 polishes on my little polishing table trying to figure out which ones were sheer enough to let the crackle come through after trial and error I found my 6.
I used Sinful Colors Forget Now, Wet n Wild Sunny Side Up, Spoiled Mind Your Own Beeswax, Pure Ice Monte Carlo, Neon Green no name from L.A. Colors, and Sally Hansen Blizzard Blue.
I really like the way this came out and I plan on trying it again with just one color.