A red spider lily.
At first he didn’t know what to make of it, unaware of the symbolism and meaning behind the seemingly-innocuous flower sitting on his bunk. Harry thought nothing of it, even going so far as to tucking it into his hair as he went downstairs to the common room. It was only after Hermione saw the flower that he understood the purpose and wishes behind the beautiful piece of forestry.
Suddenly, Hogwarts didn’t seem like home anymore.