1. Start by collecting a bunch of corks from bottles. You'll need at least 50 corks for a small tree. 2. Use a hot glue gun to attach the corks together, creating a circular base. You can glue the corks in any order you want, but try to alternate the colors for a more festive look. 3. Once you have your base, start building the tree. Start with the largest corks and work your way down to the smallest ones. Glue each cork to the one below it.