1. Cut out a butterfly shape from one colour of felt. A pair of kids sunglasses can help you to judge the right size.
2. Cut eye holes in the mask.
3. Cut a butterfly body and other symmetrical shapes out of contrasting colours of felt.
4. Stick on using PVA glue. If it doesn't stick well first time, try peeling off, letting the first layer of glue dry and then gluing a second time. This gives a good surface on both layers of felt for the glue to bond properly.
5. Decoration stuck on with glue. When dry, make a hole in each side of the mask using a skewer.
6. Make a hole in each side. Tie a length elastic into each hole and trim.