I'm personally a massive amateur of antiques, jade, jewelry, anything that blings. I also love collecting paintings, calligraphy and etc. I love going going to antique shops.
I unofficially collect stationary. I have so many pens and notebooks, most of which I haven't even opened or used. I keep telling myself I'll run down my collection of what I have first before I buy anything else, but then I end up buying something new anyways.