All those “Most Improved” player awards need to get tossed at some point, right? After all, Little League was a long time ago, and your folks didn't convert your old bedroom into a yoga studio so they could store your stuff in the basement for twenty years. Many recycling programs will break down your hard-earned, math-team accolades into parts used to create new trophies, that will in turn be given to kids today for, you know, "participating."
Used motor oil
As anybody who's ever changed their car's oil knows, you're not really suppose to dump it in the woods. And while motor oil shouldn't run in an engine again, it can be completely cleaned and used as fuel and to make petroleum products. Oil-change facilities like Jiffy Lube will often take used oil off your hands.