It's funny - I fall in between the generations, I guess. I had the metal trike (mine was blue) and the metal tractor in addition to several big wheels. I was a little old for that kind of thing by the time green machines came out - but I was jealous of the kids who had them. The cool thing is that the old-school metal stuff wasn't disposable. When my kids are visiting with my folks, they still get to ride that old stuff.
As I outgrew things I made the mistake of never asking to save anything. It all got sold or given away when I lost interest. Now, I wish I had some of it. Not sure what I'd do with it, really, maybe set things around as decorations or something. You know, a tractor in one corner, a trike in the entryway by a plant.
Same thing happened with my bicycle. I had the coolest bike on the street! A Columbia LongBoy stingray with a 5 speed shifter on the bar between my legs, a cool metalflake-looking vinyl seat, and a metallic green frame. When I got my mini-bike, I don't remember riding my bicycle again. Maybe I did. I guess it lanquished in the garage for a few years before Mom & Dad sold it in a garage sale.
See, I'm blaming everything on Mom & Dad, but there's a couple of motorcycles I wish I'd hung onto just for the h$ll of it, too, and I can't blame that on them!