Subverting Stereotypes

Meet a Slytherin from a very important family, a Gryffindor prankster and a compassionate Hufflepuff. Only they don't fit in. Shunned by their peers, they start a Hogwarts-wide campaign (and break a lot of school rules in the process). Contains the amazing colour-changing Peeves, smile-y faces, redecorated common rooms and a rather lot of defaced school property. OC-centric.