I don't have a pretty tutorial written up, but butterflies are real easy. First, do a tube bead. Then add two globs of glass to each side of the tube. (I like to layer with different colors of transparent glass.) With your tweezers, flatten the the globs of glass into pretty wings. You want to shape them as you like, so you get a good design of the butterfly wings. On each outside corner of the wings, spot heat them to glowing, grab the tweezers and pull a little to drop into a point. (Be sure to keep the piece warm as you work on the wings, so it doesn't crack.) Have fun!