I don't know where I first saw this, so I don't know who to credit. I think the idea has been around for a long time because I used to do this with fabric years ago.
Make Paper Look Old
If you want your paper to look old, crunch it up like you're going to throw it away, and dip it into a glass of brewed tea. Let it sit for about a minute and then hang to dry. If you use good-smelling tea, you end up with scented paper.
Also Remember what Tim Holtz said about first poking your finger in the middle of the paper while in the palm of your hand so it won't tear so easily when you scrunch it.