Not exactly re-using trash, but I often repair things that most people would throw away. A needle and thread can save many things from the landfill. I repaired my bike saddle bag this way, re-attached the faux leather palm that was falling off a pair of mittens, sewed velcro on a laundry bag back into place. JB Weld has rescued several items, including both my sideview mirrors. I also just noticed that my pen jar is actually a box from a printer cartridge, I've had it forever and never really thought about it.
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