Lisa Proud brings us this tutorial on aging glass jars. It's aimed at Martha Stewart-style crafters creating home decorations, but it's a good overview for prop use as well.
The one caveat I would give is the use of sandpaper. I'm sure it's perfectly safe for display-only static props, but I would be leery of using it on items that will be handled regularly. Admittedly, I'm being overly cautious. I had a distressed bottle like that shatter when I simply picked it up from a shelf and set it on a table. I still have numbness in the tip of my index finger from the deep cut that resulted.