jmarksbery,
Thanks! I guess I do model what's familiar to me...I guess I'm a little biased, but Ky is the most beautiful country in the world to me! Plus, the dirt I use came from right here in my own back yard! (literally!

) I laid it out on the driveway, in the sun, to dry, & then sifted it through a window screen.
jimnrose,
as far as earth colored paint, just go with any nice, basic tan color...nothing too dark, or too white...I use this old (seriously, I've had this same gallon of paint for 10 years!

) can of paint from Sears...I think it's called Desert Sage, or something like that...
As for rockwork, I've found that carving my own out of plaster is faster & easier than using the molds...In fact, I was cleaning up in the workshop recently, & I was going to throw out some scraps of foam, but decided I would use the digital camera to do a little "how-to" page on woodland ground cover...It describes how I do my rockwork...(btw...these techniques will work on any scenic base) It's at...
http://hometown.aol.com/cvdiv/fsb2-1-160.html
I've also got a thread in the N scale forum here (N Scale Trees - Cheap Fast & Easy) which describes how I make trees.
Maybe some of this will be of use to someone.