You could help each child make a "garden leaf" shirt. What you do is take a clean 100% cotton shirt (for mine I snitched one of my brother's dress shirts he hated), and iron it -- no starch or sizing! Then you get a piece of scrap lumber and a hammer and a piece of plastic wrap and take them outside with the shirt. Go into the yard, garden, even a weedy corner, and choose leaves that you think will look interesting on your shirt. To make the leaf print on the shirt, put the board on the sidewalk or driveway, then the part of the shirt where you want the print of the leaf to be, the leaf, and then the plastic wrap. Now, all you do is hammer the leaf all over, and the green from the leaf will be pressed into the shirt fabric. You can make patterns with the leaf placement, or something entirely random. Leaves with lacy edges and fingers are particularly interesting. When you are finished, the shirt will be covered with green leaf prints! The more you wash the shirt the more the green will gradually fade to yellow. A few special notes -- always put the board on a sidewalk or concrete step and NOT on lawn furniture, which isn't sturdy enough for all the pounding with the hammer. Besides, hammer strikes can go astray, and you know what will happen to your glass-top table! You need the board for the evenly flat surface to get full coverage with the green -- no matter how smooth you think your concrete is, it isn't smooth enough. You need the plastic wrap to avoid getting green on the hammer and then spreading green outside the leaf, and to see the leaf. You need to hammer the leaf thoroughly so ALL of the leaf is printed into the fabric. You get different results depending on whether you have the top of the leaf or the bottom of the leaf on the fabric. This is a bit like intentional grass stains. I think you could leaf print some quilting fabric if you like, either for blocks to show off particularly pretty leaves, or even do a large piece of white backing fabric, although I have not tried it myself.