Symbolic objects in harry potter and the prisoner of azkaban!! help!?

for my english class i have to do a project on harry potter and the prisoner of azkaban and i have to find some objects that represent the themes, characters, and/or relates to the content. right now i have a feather to represent how buckbeak was wrongly accused, the marauders map to represent the duality of life and a picture of the time turner necklace to represent that everything is not what it seems. i need 2 more objects and this is due tomorrow. soo please if u have any ideas help