Turn plastic waste into a whimsical garden decoration with a DIY windmill made from upcycled plastic bottles. Start by collecting empty plastic bottles of various sizes and colors. Cut off the bottoms of the bottles and trim them into petal-like shapes. Attach the plastic petals to a central axis using a metal rod or a wooden dowel. You can paint the petals in vibrant colors or leave them transparent for a more ethereal look. To add extra flair, decorate the central axis with beads or small trinkets. Once your plastic bottle windmill is complete, place it in your garden and watch as the wind brings it to life. This eco-friendly project not only adds a pop of color to your outdoor space but also promotes recycling and sustainability.