You don’t need a lot of supplies to make some good rubbings. Just provide the students with plain paper and some crayons. Instruct them to remove the paper from the crayons before they begin.
Next, head outside and search for leaves or bark to rub. Place a piece of paper on top of it, then rub over it with the side of the crayon. Have the students experiment with different colors to see which ones show the texture the best.
Take the rubbings back inside. Then have the students identify the kinds of leaves they found based on the rubbings.