i have seen some beautiful instruments made from Osage Orange wood
the wood is orange colored.
http://hedgeapple.com/static/images/guitar.jpg

but then it is not so unusual to make an instrument out of wood..

there is also a mandolin made from a chamber pot...or bed pan........it might be called a commodium...

http://www.newsreview.com/reno/content?oid=42163

this article talks about it and all the other imaginative
instruments Joe Craven plays.

http://jazzmando.com/keith_carey.shtml

http://cdbaby.com/cd/joybuzzards