Without really knowing exactly what I was doing, and just plugging some stuff
into the editor and changing some values, I got this in 5 min:
(many thanks to Mike Williams   http://www.econym.demon.co.uk/isotut/
and David Wagner   http://wiki.waggy.org/dokuwiki/povray/stainedglass)

#version 3.71;

global_settings {
  assumed_gamma 1.0
}

#include "colors.inc"

camera {
 location  <0.0, 0, -5.0>
 right    x*image_width/image_height
 look_at   <0, 0, 0>}

light_source {<10, 10, -30> White}

#declare Packing = 1.3; //(increase to make more tightly packed)

#declare F =
function {
 pigment {
  crackle
  form < -1, Packing, 0>
  metric 3
  offset 0
  turbulence 0.1
  color_map { [0 rgb 1] [0.99 rgb 0] [1 rgb 0] }
  scale 0.25
 }
}

isosurface {
        function { F(x,y,z).red - 0.5 }
        max_gradient 5.5
        contained_by{box{-1,1}}
        pigment {rgb 0.9}
}

Just needs some tweaking, colors and textures.
NO idea how to get the parts sliced smooth by the container removed, but I
supposed doing a difference or intersection with a highly textured box or
something might be a good way to fake it.

Sorry officer, there was no posted speed limit.

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