If you are not making a rock face, I've had good results using carved foam covered with thin furniture batting (white glue) Once dry, soak with a dirt colored paint and then cover with ground foam or grass. I've also used plaster cloth, packing paper and foam coated with thin coats of mortar mix or grout (left over from home projects). If I wanted realistic rock faces I would probably use rock molds and create them that way. Rich at Black Diamond does something similar. I've seen guys carve rock faces, I am not sure I would get decent results.
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