Beautiful ombre technique (Ombre is NOT where each nail is a different color. That is a mono-chromatic color palette, like you would find on a chip from a paint store. Ombre is a gradient from one color to another.
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.