You can either apply the texture only once to the whole wall of stones
so that each stone will have its unique texture (the problem being that
sometimes it's too clear that there's a single texture applied to the
whole wall, which looks bad), or you can create a set of eg. 20 different
stones with different textures and then create the wall by randomly
selecting different stones and rotating/reversing them randomly.

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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