Photo Credit: Courtesy of 3DStockPhoto ( image)
https://preciousplastic.com/ Is a fantastic project that promotes plastic recycling into useful objects. They offer free blueprints, videos on how to build the recycling equipment, and offer suggestions on what to make of your recycled goods.
Personally, I am looking into making garden bricks or paver stones. I have not found the ideal temperatures or heating methods just yet.