I've used dirt from the backyard, the garden, wherever. I've just made sure that it's "natural" dirt, not potting soil or anything like that. I sift it to get rid of the big stuff like stones and such. Then I mix it up with some water, grab some brushes and go to town. Plan to have some "crap" brushes when you're done, however. (Use cheapies!
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I'm planning on writing an article for my club newsletter about how to use real mud on military models, and will also publish it to my website. Right now there's a photo of my mud-covered T-34/76 on the site. (you may have already seen it, though, as I've posted this shot to the forums in the recent past) But if you'd like to check it out, here's a link:
www.spasticforplastic.1hwy.com
My apologies in advance for all the pop-ups!
Fade to Black...