i collect a few things!
if i really like the book, i don't mind what kind of paper copy i have, but i won't deny it's nice to have special editions! some of my favourite editions are the discworld collector's library editions of the city watch books, an anniversary one-volume illustrated copy of lord of the rings, and a few folio society editions i found.
i especially love wooden and metal buttons with natural or historical-styled designs, but i love any fun whimsical buttons.
i get less of these because they're expensive! but i have a lorien leaf fellowship pin and a few more.
i have a few keychains from cons!
mostly i have activism pins, but there are some few fun ones i got at cons!
most of my plushies are gifts from my beautiful wife! i also have a plushie dreadful autism bunny
bladed: i have andúril, a dagger version of one of geralt's witcher swords (steel for humans), a sting replica letter opener, a plush sting, and a sword-shaped letter opener from a castle gift shop. also a wooden sword i snapped in half two swings in because i'm just too powerful. and a basic duel-grade lightsaber. non-bladed: i have a tiny model trebuchet! it works (mostly) & i love it.
i discovered the reusable sticker book and got very excited to be able to collect stickers without having to worry about where to put them! they're one of the cheapest sort of 'custom things' to collect.