Maybe because it's so freaking hot pretty much across the entire United States right now. Neons just seem appropriate. I used my NYX Girls White, NYX Girls Pink Strawberry, NYX Girls Bubble Gum and NYX Girls Hot Orange. Then Milani Rad Purple and Milani Fresh Teal. I love all of these colors together!
A thin striping brush makes this design really easy to pull off. You want it to look sort of messy, so it's a hard one to get wrong.