Polyvinyl chloride (PVC) is durable and holds up against moisture and corrosion. That makes it a good plastic for pipes, construction material, and medical devices. But its high chlorine content ...

Sure, you could just drop it in the recycle bin -- but it could also be "upcycled" into a rocket like ... keep all of the wiring in place. Cut the PVC pipe to a length where the wires just stick ...