Costumes are where you can get creative! Use your imagination and make costumes from what you already have, borrow from a friend, or go to a thrift store. This time of year second hand stores have all their Halloween merchandise displayed and ready to be put to use. TerraCycle is sponsoring the Monster Mash Your Trash Costume Contest . Terra Cycle is encouraging us to learn in a hands-on way how every day waste materials can be reused into unique, innovative products. Enter your upcycled costume by November 4th and you could be one of four contestants to win a gift card for cool TerraCycle upcycled products.