Paint your nails white. Pick all the colors you want to be on your nails and a straw for each color. Next dip the end of the straw in a color of choice then blow and the paint will splatter on your nails.
Put water in a bowl, drop random colors of nail polish in and swirl with toothpick. put petroleum jelly on your fingers so the polish only sticks on nails not your fingers. Stick fingers in bowl, nail polish should float on top of water.