When I was a kid, I had inherited and built upon my two older brothers' collection. When it got to the point of overfilling a refrigerator box, we couldn't haul my massive box of goodies with anymore every time we moved.
Now, poor isn't the right word, but I was far from privileged. After I had to give up my toys, we couldn't spare money for stuff like that. Maybe on the rare occasion but at that point, I started making my own toys from, pretty much, garbage. Whatever I found around: I'd collect, bring home, cobble together, play with until I couldn't fix it anymore.
Believe it or not, that whole set up was just for me to say: my favorite toy was whatever I made.
Now, as an adult with unbridled affection for useless things and terrible spending habits, I've got to say my favorite "toy" as of now is easily my Hot Toys Nicholson Joker.
For my "props", it's gotta be (if it can be counted as such) a piece of the Igloo from STAR WARS that I was given for my donation to the Save The Lars Homestead Project. It's just a piece of old concrete, but dammit, I love it.