i wish i would have had this guide a few years back when i made my "book o de dead". i just went with TONS of tea, soaked the pages, and left various ones outside (above bugs) with little bits of bread and sugar on top for a week or so.
lots o mold that way, and the prop stank so damned bad i sold it.
Hydin -- one of the secrets I don't mention in the tutorial is to rub the backs of your pages with rosin (like you get for a violin bow). It gives the pages a GOOD smell that is often equated with age.
Well, I always hated when people would mention an awesome product and then not show you where to get it. I actually get my walnut ink from an extremely well-stocked scrapbook store. They sell the luggage stamps as well, and bags of watch faces, sealing wax, etc.
It's sometimes hard to deal with the help -- they're all about scrappin', but they've given me good suggestions on distressing paper and such.
The rosin trick is actually an old magicians trick for using props in a performance. Smell can create such a strong mental image, it really helps when creating "props" that have a prediction or whatnot on 'em.