Okay here is your challenge Abandoneers!
July-The Giving Tree
Your mission (if you choose to undertake it): Create a tree that bears artistic fruit. Abandon a few artistic creations and tie to the limbs of a tree for "finders to discover". This could be really cool if a number of artists teamed up. Also you probably want to be sensitive to the tree and not use super heavy art pieces...so bronze sculptures might not be the best for this challenge.
Make sure you document it and share your adventure with us.