Hmmmmm..... Well... Besides my obvious bookmark collection that I actually haven't updated in years, I sort of do get and keep all sorts of stuff, paper clips and recipes, little trinkets, shiny stuff I find on the ground... I have a huge collection of feathers I found... Expired makeup and books I don't read, besides anything that anyone has ever given to me since I first arrived here. Even cool pieces of clothing I won't ever wear, but look too cool, I keep. It may sound like a bunch of waste, but you can always find a use to anything.
I collect those tiny mlp blind bag models, those Neopets handhelds, Pokemon figures, manga, and a bunch of other collections that I kind of half ass. I'm impressed by everyone's photos, dang.