Creative Help Needed!

Alright everyone, my sister needs a little bit of creative help. She's a photography major in college and her next assignment is giving her some trouble. She has to come up with a series of photographs that create a story, but also have to have color symbolize something (say... a girl wearing a green dress represents envy)
She's completely open to anything! The good thing about college is there are no rules, especially in art school =)