Maybe you could make frameable silhouettes out of the leaves.
Place different sizes on heavy matting——then spray-paint lightly all around them.
Remove leaves-—when paint dries you’ll have a frameable silhouette.
Nice idea. There’s also Sun Art, or Sun Prints; we got this for our nephew one Christmas - I don’t think he was thrilled (I’m always trying to include ‘creative stuff’ which hasn’t gone over well ;-), but I wanted to play with it myself:
https://shop.nga.gov/item/024508/sunprint-kit/1.html?gclid=CMvwke_SqM8CFdNahgodvC0ATw