I found a sort of "gold mine" with displacement warps on MegaPOV. Here I
used a wrinkles pattern as base, displaced with a "sandwich" of several
other patterns:

#declare fh=rand(r_terrf)*1000;
#local fn_Form=
    function {
       pattern{
         wrinkles scale 10
         warp {
          displace {
           gradient y
           pigment_map{
            [0.0 granite
                 scale <3*rand(r_terrf),3*rand(r_terrf),3*rand(r_terrf)>
                 rotate 360*rand(r_terrf)]
            [0.2 bumps
                 scale <3*rand(r_terrf),3*rand(r_terrf),3*rand(r_terrf)>
                 rotate 360*rand(r_terrf)]
            [0.4 crackle
                 scale <3*rand(r_terrf),3*rand(r_terrf),3*rand(r_terrf)>
                 rotate 360*rand(r_terrf)]
            [0.6 dents
                 scale <3*rand(r_terrf),3*rand(r_terrf),3*rand(r_terrf)>
                 rotate 360*rand(r_terrf)]
            [0.8 leopard
                 scale <3*rand(r_terrf),3*rand(r_terrf),3*rand(r_terrf)>

                 rotate 360*rand(r_terrf)]
            [1.0 granite
                 scale <3*rand(r_terrf),3*rand(r_terrf),3*rand(r_terrf)>
                 rotate 360*rand(r_terrf)]
           }
           warp{turbulence Terrain_Turb}
           scale <10,2.5,10>
           rotate 360*rand(r_terrf)
          }
         }
       }
    }

#local fn_Terrain=
    function {
      y
      - fn_Form(x, fh, z)*Terrain_Height
      - fn_Form(x*10, y*10, z*10)*Terrain_Height*.05
      - fn_Form(x*100, y*100, z*100)*Terrain_Height*.005
    }

//----------------------------------------------------------

Peak memory used:          18647911 bytes
Total Scene Processing Times
     Parse Time:    0 hours  0 minutes  3 seconds (3 seconds)
     Photon Time:   0 hours  0 minutes  0 seconds (0 seconds)
     Cloth Time:    0 hours  0 minutes  0 seconds (0 seconds)
     Mechsim Time:  0 hours  0 minutes  0 seconds (0 seconds)
     Render Time:   4 hours 37 minutes 50 seconds (16670 seconds)
     Postpr. Time:  0 hours  0 minutes  0 seconds (0 seconds)
     Total Time:    4 hours 37 minutes 53 seconds (16673 seconds)

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