Found this article from nasa.gov about a guy trying to track down all the trees sprouted from seedlings that went to the moon and back.

They packed all kinda strange things on these moon shots. Dayton has a section of the original Wright flyer skin that went on, I think, Apollo 15. My dad has a coin and a tiny American flag that went on Apollo 11. Sometimes I wonder how they managed to have room for the astronauts. But all in all, pretty cool.