Osage Orange is a good, sturdy tree. The heavy, close-grained yellow-orange wood is very dense and is prized for tool handles, fence posts, electrical insulators, and other applications requiring a strong dimensionally stable wood that withstands rot. Withstands rot ... a BIG plus!
Interesting info on the Osage Orange ...
http://www.osageorange.com/Osage_Orange_P.htmlOther than the Osage Orange, I've taken to building my own trees using PVC pipe and epoxy covering. I texture the epoxy with modeling tools and latex or silicone press plates made over distinctive bark found on my property. It's nice ... no two trees are exactly the same.
There are some fantastic leaves being manufactured and carried by Autograph Foliages, and Commercial Silk Int. Combine all these "ingredients" and you have some terrific looking trees.

Good luck to you!
John.