What are some things you collect?

Im not really an avid collector, for some reason i used to collect crystals (im a guy btw). They were those overpriced real yet worthless crystals you could buy at the store, although i actually found some myself. Nowadays i still collect random shit (like volcano stones, and some other stuff).

Something other generic i collect are trading cards, because thats what they are for, trading and collecting, and its pretty fun.