These projects require few materials besides plastic bottles and minimal help from adults, all while offering a whole lot of fun.Rocket Piggy Bank. ... Halloween Milk Jug Ghosts. ... Plastic Water Bottle Flowers. ... Rainbow Bubble Snakes. ... Bottle Penguins. ... Milk Jug Toss. ... Soda Bottle Flower Prints. ... Rocket Fueled Jet Pack.More items...