You will need: leaves (a few different shapes and patterns is helpful, but not essential), crayons, thin paper.
During your walk or in your garden, collect a few leaves of various sizes and shapes. Ideally 4-6. Position the left so it is upside down (botton up with the veins facing you) on a hard, flat surface (like a table). Place the paper over the leaf (if you have a very small child, you may wish to tape the paper down). Using the side of the crayon, rub the crayon very gently over the leaf. Do this over and over again until you see the pattern appearing. Now remove the leaf.
Can you explore? what other interesting patterns can you find in your garden? We found bark rubbings looked really cool, fence panels, big rocks and grasses looked interesting.
