If you'd like to achieve this look, start by grabbing a bunch of polishes you like or think will work well together. I just used whatever I had laying around.
You'll also need a piece of scrap paper, a nail file, polish remover, and a small piece of a kitchen sponge, cut into smaller pieces. First, apply a base so that the colors stand out a bit - I used light pink. Then use the sponge pieces to dab color on. Clean up around the edges with the nail file & a q-tip doused with remover. Apply a clear coat over top and you're good to go!