Magazine covers of my faves,Albums, and nail polish. I have 36 magazine covers so far,17 albums, and over 50 bottles of nail polish. I'm not that deep but I'm just starting and I'll get more as time goes on so yeah.
I collect everything and anything Britney, I have basically a bookcase in my room dedicated to her with all of her albums, cds, memorabilia, magazine clippings.
Catwoman books/comics, oversized stuffed animals, and any little birthday/holiday/etc. sentimental cards.
Besides the usual stan things, I used to hardcore collect magazine covers of my faves, but I stopped that last year. It's a really impressive collection so far though