If you have ever wondered about how to make skeleton leaves this site gives you instructions.
I was agonising over this link trying to decide if it was off topic then decided that since leaves are fiber it was OK. It also fits into the paperarts category as many people who are interested in visual journals, altered books, ATCs (Artists Trading Cards) and handmade postcards will find the information of value.
Then I discovered Make A Skeleton Leaf for your Altered Book and that clinched it
Each link provides a different recipe for the process.