Here is a good view.
Use the ultra hold heat and bond. I got mine at JoAnn's I think most craft store will have it. Apply the heat & bond the way the instruction says on 1 layer of fabric. Pull the paper off and put on another layer of fabric. ( sandwich the heat and bond between the fabrics in other words) And then cut your butterfly out and attach it to the quilt block or what ever you want it on.
Class is over now go have fun.
Misty , I for got to say you can use any kind of fabric. Not just the type I used and still do it like I said above.