I have found 2 aluminum baseball bats, an Escape grill, A ford Ranger/Explorer Aluminum Rim with a shredded tire, a few steel rims, with crappy tires. I once found a Brand new white wagon wheel rim/tire combo that was a perfect fit for my D21, but the tire had a road rash scar all the way to the wire on the inside. the tire still had the sticker on it, but the damage was too bad to trust for a spare. I've recently found a Power Wheels Mustang, practically brand new. I made a few mods to it so it would be more fun. (Larger battery and bicycle tires cut up and screwed to the wheels for more traction.)
I tend to stop at all trash piles and the like, living in a college town, I see whole aprtments sitting out by the road in piles and heaps. I'm not too proud to stop and plunder. I also just came across a box that had about 10-12 cans of spray paint and some sanding sponges and a belt for a belt sander, still in the package. I just don't have a belt sander for it.