Cotton Candy = pink/blue (two most common colors of cotton candy)
Watermelon = green/pink (like a watermelon)
Ninja = black/black/black (everyone knows ninjas wear black)
joker = purple/green (like OG batman charactor - the joker)
scarface = black/white (like the poster, can also have scarface strap/softies
storm trooper - white/white (like a storm trooper)
these things just make sense.