Thanks for your replies, everyone!
I also collected Hotwheel cars. I would keep them lined up in my dollhouse. I think the dollhouse saw more use as a parking garage than a dollhouse.
I wish I’d kept my Wacky Packages; I had all of them at one time. I guess they are worth quite a lot of $$ now. There are several collector’s websites dedicated to them.
You don’t want to know about my crawdad claw collection…
Considering I was a tomboy until about, oh…five minutes ago, my collections were very girly and quite unoriginal.
I had quite a sticker collection. I also collected Hello Kitty stuff.
As a teenager and young adult (I guess from 18 - 20) I had a condom collection. They were all unused, of course. I had every color and flavor imaginable. I also had glow in the dark ones, one’s that looked like a ruler and others. My hubby (we’ve been together since we were 17) thought I was so weird!
I collected live ammunition.
It started when I found a dozen .44 Magnum cartridges in a field. Never did figure out what they were doing there. My stepdad took them from me and had a friend who was fairly familiar with firearms check them out. He decided that they weren’t corroded in such a way as to be dangerous, so he gave them back. This was when I was in the fourth grade. I guess I kept them because that was around the time that the Dirty Harry movies were coming out.
I kept the collection in a tackle box, each bullet padded so they didn’t roll around too much. I would ask any hunters in the family or neighborhood for one bullet for each type of gun they had, so I got a good bit of them.
The best ones were the .44 Mags and some sort of Argentine assault rifle rounds one of my uncles gave me. He owned a wrecking yard and found them in the glove box of a car in his junkyard. A cousin also gave me a couple .50 machine gun bullets (without the cartridges) that he picked up off the test range when he was in the Army. Those weren’t as cool, since the rest of the collection was live ammo.
I was never really into guns in any way, and never interested in researching all the types I had. Some, I couldn’t even identify, but I didn’t worry about that.
During my freshman year in college, I decided I was no longer interested. I didn’t feel it was a good collection to try to pass on to a younger cousin or some such, so I decided to destroy it. I pulled all the bullets off with pliers, emptied the cartridges, and through them into the deepest part of the local creek (where they hopefully corroded away safely, since they still had live primers). I took a bit of firecracker fuse and set off the powder I’d taken out of the cartridges. I just burned it, since I didn’t trust myself to safely pack it into some sort of explosive setup. It filled up a Sucrets tin, and burned in about a second.
That should have said that I threw them in the creek.
Sorry for such a long post. I guess I’ve always worried that people would think I’m some sort of nut for collecting ammo, so I tend to over-explain myself.
Star Wars figures. I’m supirsed no one else does, or said anything about it. I’ve got most of the stuff, too bad it’s mostly broken now. 
I collect them too! Well I don’t really collect them but I always save them because it seems like I always need them to be carrying my stuff around in … but it kind of counts as a collection because I only save pretty ones 
I also collect tags, like from clothes. I hang them all up around my windows (it looks pretty cool). Right now I have about 80 which is almost enough to go all the way around the window frame. I even have some from France that my best friend brought me back when she went there
Stickers
Bookmarks
Baseball cards *
Stamps *
Rocks, seashells, feathers, leaves, flowers, moss, bark, caterpillers (raised monarch caterpillers to butterflies every summer) etc. Nature-y type things. I was never really gung ho about commercial kind of stuff. I half-heartedly collected baseball cards for a while when I was about 7, but that was only because my cousin Luke collected baseball cards, and I thought he was the coolest person on the planet, so I had to, too.
Rocks/minerals, plastic dinosaurs, books, foreign currency, stamps, cats (stuffed toys, pictures, and I had quite a few real live ones roaming around), shells, butterflies and bugs (mum learned quickly never to open unlabeled plastic containers in the freezer), Stompers (battery operated cars), hats, bats (stuffed, pictures, etc), Hot Wheels, and whatever else caught my fancy for the moment.
I collect postcards. There was a time when I had every postcard sold in Park City and Salt Lake City Utah. My grandparents still send me postcards when they go on trips, specifically for my collection. Even Anthracite has sent me postcards from as far away as Poland and England!
I did, and still am, collecting fantasies 
Baseball cards (just about everything from 1981-1990, they’re sitting in a closet in my parents’ house right now)
Banana stickers. Y’know, those little Dole or Chiquita labels stuck on the peel. Sometimes they’d say which country the bananas were from. I had about 40 of those.
–sublight.