Here's a scene demoing a rock wall texture using MegaPOV. (Code below....)
It isn't perfect - note the horizontal surface in the foreground - but it
works pretty well on most surfaces.
There is room for improvement; in particular, instead of one basic rock in a
lot of colors, -some of which end up looking a little like that colored
concrete that was fashionable in 1960's suburbia- one could use "blotches"
(or "crackle solid")  with a pigment_map with four or five well-defined
stone types at /*A*/.

    Spider - you can consider this as a response to your "favorite texture"
question!

    -Robert Dawson

#declare RoughStone = texture{

             pigment{crackle pigment_map
                   {[0.08 granite scale 0.2 color_map
                           {[0.5 rgb 0.8]
                            [0.8 rgb 0.2]
                           }]
                    [0.08 average pigment_map     /*A*/
                                {[0.2 granite]
                                 [0.8 blotches  color_map
                                        {[0.0 rgb 1]
                                         [0.7 rgb <0.8,0.6,0.6>]
                                         [0.8 rgb <0.8,0.75,0.5>]
                                         [0.9 rgb 0.3]
                                        }]
                                } ] }
                }

        normal {average normal_map {
                        [ 0.6 crackle 2 slope_map
                               {[0.0 <0,0>]
                                [0.08 <0,0>]
                                [0.08 <0,1>]
                                [0.7 <1,0>]

                               }]
                        [0.4 granite 1.5 ]}
             }
        finish { ambient 0.05 diffuse 0.95}
        }

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