This origami dollar bill butterfly is called a Money Twist Tie Butterfly because it requires something to tie the two pieces together: something like a twist tie or floral wire. It uses two $1 bills and a twist tie.<br /> <br /> A twist tie is a thin metal covered with paper or plastic. It is flexible and is often used to keep bags closed. You can also use a pipe cleaner or an elastic band. Anything flexible and can fasten things together would work!