Go on a nature hunt and ask the children to gather up all different types of leaves. Look for ones with pronounced veins on them so they stamp well.
We used box tops for the base of our stamps but you can use other things too. Scrap wood or cardboard may work nice. Place glue on the smooth side of the leaf and adhere it to the top of your box top.
After the glue dries paint your leaf with paints. From our experience acrylic paints worked best but you can try your hand at watercolors. You may even try to use a stamp pad to see if it works.
Push the painted leaf firmly onto the paper and have the children do the same to create beautiful designs.
These could be beautiful cards or classroom decorations. Enjoy!