This would make a great home school project for your young children. Just take a walk around your yard, or go to a nature trail, or out into the woods and let your child choose a some pretty leaves. Take advantage of this time to discuss some basics about the eco-system... teach him how to pick without harming the environment... don't over-pick. If you're picking anywhere other than your own yard, teach him about ethics and responsibility by including him when you ask permission. Always get permission, even if it's in grandma's yard. Of course grand won't care, but It's a good lesson for your child.