I don't like having a lot of clutter, so most of the things I collect I also can use:
- Books : of favorite authors, or favorite stories, or collections, etc... all stuff I will read multiple times!
- CD's I thought I had a lot of CD's (roughtly 200 now).. until I met my boyfriend, who has literally over nearly 1,100!
- DVD's : Since I love movies and got a DVD player last Christmas I've been collecting DVD's... lately it's been a lot of kung fu/wire fu stuff, but it depends on my mood
- Speed Racer stuff: I love this cartoon, and have a few really cool things, like a metal sign of Racer X, my favorite character, and a small matchbox-type Star 9 (his car), as well as a "to scale" Mach 5. This is one of the few things I don't "use" but still collect.
When I was a kid, one of my mom's good friends was a missionary in Latin and South America, and he would bring home all kinds of coins from different countries. I have a small collection of foreign coins including those and some from when I finally got to travel abroad myself. I don't really keep up with it, just something I have as more of a memorabilia thing.
I really like turtles, so I have quite a few turtle things (stuffed animals, jewelry, etc.) that friends have given me, but I don't really collect them.