Collect just-fallen leaves, and press between the pages of a heavy book for two weeks.
Use a small strip of plain paper for base. With a skewer, apply glue to tip of a leaf; secure to base for a bottom wing.
Working from bottom to top, glue remaining leaves, which should overlap slightly, to base.
Glue two leaf stems to the top of a thin leaf for antennae.
Glue thin leaf vertically to white base for the butterfly's body.
A mat border and frame give a finished look while protecting the leaves.