Easy Stone Walls
Pre-mixed drywall paste, craft type acrylic paint and a mold made from a cat litter pail lid can make anyone an expert "Stone Mason" in any scale.
Mix water based acrylic paint with the drywall paste.
Spread it out evenly onto your "casting surface" (Mold). Here I have used the lid from a pail of cat litter as my mold.
This is where you determine the thickness of your stone. I wanted flat, semi-thin rocks, so I went about 2 -3 mm's thick on the spread. Let dry for at least 12 hours.
Once dry, it can be broken into whatever size stone you require (this is why this process works so well in any scale).
I used a piece of scrap sheet styrene as a base to ease assembly and facilitate any detail painting, drybrushing, etc.. I used Crazy Glue (CA) in assembly but I'm sure that you're favorite brand will do as well.
The assembly was attached to the base upon its completion.
That covers the basic technique. You should seal it and finish it with standard techniques. Dave shows his materials and finishing techniques.