This is way easier than it looks at first glance.
China Glaze White On White
Start off with clean nails and sponge on a white polish at an angle across the lower half of your nails. The white will make your neon pop but its not necessary if you chose cream or metallic colors.
China Glaze Love's A Beach/ Splish Splash
Once the white is dry paint your pink and blue in stripes across the edge of a sponge. Dab it on lightly and let the purple magically appear. Be sure to reload your sponge for each nail and for more even coverage. I did each nail twice with the neon. Let it dry between layers or you'll pull up polish with the sponge.
Bundle Monster Image Plate BM12
Konad Special Polish Black/ White
Stamp your design in white on a diagonal across the top of your gradient tips.
Stamp your black polish over the white but this time try not to line it up perfectly over the top so that it shows. I don't really have to try not to line it up... I couldn't line it up the exact same if I tried lol :)
Add your top coat and it looks like someone spent a very long time on her nails.