Instead of a couples costume set, I need an idea for 3 girls for Halloween. Got any cute ideas for the trio?

I was thinking along the lines of the "Three Stooges,"... or other characters, or even three types of candy. Anything where the costumes work together to team them all up as one big costume. I am making these costumes, so anything goes, I just need to get started on it as soon as possible! Thanks for your help!