The leaf mobile that I made and (James) hung in Jones' room:
I collected leaves from around the neighborhood--I tried to get different colors, types, sizes. Then I "laminated" the leaves in Contact paper, punched a hole through each, and tied them to a large skinny stick with fishing line.
I got the inspiration from one of the Parenting magazines I've read recently (can't remember which one!)
It was super-simple, but gives Jones' room a cool, nature-y feel. He loves to look at it, and someday I can tell him that we collected the leaves on our walks together during his first-ever Fall.