I have a collection of ticket stubs, most of them are movie tickets but I have at least one or two performance tickets as well such as for the Rugrats Live play I went to as a kid.

I've also got a collection of currencies that my best friend has brought me from her travels.
I have Yen, Hawaiian coins, and some Canadian money that I can recall. I did have some Canadian currency from my own trip over a decade ago but I lost it. :(

I collect makeup... I mean more than the usual. I like collecting unique and cool packages. I save my old products that I used up (after I clean them) and I even save cool packages

i collect cds and wish to soon start collecting vinyls too

I'm an unofficial collector of books and fabric. Fabric, well... I always want to sew with it, but I got a lot and some is just for petting. I just don't dare to cut in it. Books, I love them all, goal is to have my private Dutch library. Which is kinda useless, especially now we can get everything online, but I just love to have them. And they're pretty. <3 if I get enough to fill all the shelves, I'll go dig through them and get rid of the one's I don't like to read. Or move more children's books to my kid's rooms, but there's still quite some shelves to go. :D :D

I collect cds and i hope to soon be able to start collecting vinyls too!
(not sure if i'll ever be able to afford that haha)
i always buy my favourite artists' albums but i don't have a cd player to actually listen to them yet, so i just keep them for the aesthetic.
i also collect retro videogames and consoles, (i actually only have a few) but i want to start buying old gameboys on ebay and fix/clean them up with my bf!
my "collections" are quite limited atm, not sure if they count as collections yet haha

I'm a serial collector. When I have a hobby, I want to own everything about it.
When I started doing coloring books for adult, I bought a ton of pens. I have so many now X)

I'll go through phases were Ill collect something for a few years, then I wont want to look at it anymore, then I start collecting it again.
I have a Gemstone/Rock collection that I currently have put up in several boxes. I also went thru a Teapot/ Teacup phase, some of them I have put up in a cute little glass hutch.
I've also been collecting Pokémon cards ever sense I was a kid, but because of how things are now, its kind of hard to find them nowadays.

Transformers, dolls, TTRPG dice, TTRPG miniatures.... Critical Role merch (both official and fanmade)... Basically, if I have an interest in it, I've got something from it that I collect.

i used to collect rocks or anything small enough to fit in the palm of my hand and carry it home (basically hoarding lol), and also plush dolls. now, i try not to hoard... and instead have a bullet journal to keep all my receipts of memory and other jots of notes people have given me because i don't want to throw them away c':
i'm not even halfway there and the journal is so fat haha;;

i collect coins from different states and provinces, and also strangely movie tickets. Anything else is kinda just incidental i think.