I've reassembled my sampled bricks into a couple of macros, in case anyone
wanted to play with it more easily.

See thread
http://news.povray.org/povray.binaries.images/thread/%3Cweb.5ad633941828641ca47873e10%40news.povray.org%3E/
for images and background...

// - - - - - - - - - - - - - - - - - - - - - - - - - - -
// bricks with brightness sampled from specified pigment
//
// pattern only with no mortar
// call this macro instead of a pattern type in a pigment
// block - this allows a color_map to be specified
//
#macro BrickSampledPattern(Bricksize, SamplePig)
 #local BSX = Bricksize.x;
 #local BSY = Bricksize.y;
 #local BSZ = Bricksize.z;
 #local SamplePigFn = function { pigment { SamplePig } }
 #local PigFnOffset = function {
  SamplePigFn(x - 0.5*BSX*floor(y/BSY), y, z - 0.5*BSZ*floor(y/BSY)).x
 }
 pigment_pattern {
  function {
   PigFnOffset(
    BSX*floor((x+0.5*BSX*floor(y/BSY))/BSX) + 0.5*BSX,
    BSY*floor(y/BSY) + 0.5*BSY,
    BSZ*floor((z+0.5*BSZ*floor(y/BSY))/BSZ) + 0.5*BSZ
   )
  }
  translate z*0.5*BSZ
 }
#end

// - - - - - - - - - - - - - - - - - - - - - - - - - - -
// bricks with brightness sampled from specified pigment
//
// complete pigment with mortar and color_map
// call this macro in place of a pigment block
//
#macro BrickSampled(Bricksize, Mortarsize, Colormap, MortarPig, SamplePig)
 #local Bricks = pigment {
  BrickSampledPattern(Bricksize, SamplePig)
  color_map { Colormap }
 }
 pigment {
  brick
  pigment { MortarPig }
  pigment { Bricks }
  brick_size Bricksize
  mortar Mortarsize
 }
#end

// a couple of usage examples
// actual pigments and color_maps left as an exercise for the reader!

#declare LCol = <1, 0.5, 0.5>;
#declare DCol = <0.2, 0.2, 0.5>;

box {
 <-6, 0, -2.9>, <6, 10, 2.9>
 pigment {
  BrickSampledPattern(<0.5,0.25,0.5>, MyWallPigment)
  color_map {
   [0 rgb 0.1*DCol]
   [0.5 rgb DCol]
   [0.5001 rgb 0.1*LCol]
   [1 rgb LCol]
  }
 }
 finish { ambient 0 }
}

box {
 <-6, 0, -2.9>, <6, 10, 2.9>
 BrickSampled(<0.5,0.25,0.5>, 0.035, MyColorMap, MyMortarPigment, MyWallPigment)
 finish { ambient 0 }
}

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