Let's see... in some kind of chronological order...rocks in a yellow pail that sat on my porch as a kid, dog figurines, plush dogs, Johnny Cash albums, baseball cards, those puzzles that used to come with Donruss baseball cards, big band albums, Magic:The Gathering (short-lived, in 8th grade), musical instruments (i'm a trombonist), video games like NES, SNES, Sega, all the ones I rented and played as a kid...vinyl records, anything else "vintage" that I manage to find interesting...
Basically, these days it revolves around what I remember from my not-so-distant childhood or what my parents could have had as kids...