OK. Did some experimenting with layered textures. This does not work. A 
pity, as I find it more *elegant* :
//------------------------------------
#declare Group =
union {
  box {
    <-1, -1, -1>, <1, 1, 1>
    translate  <-0.3, 0.0, -0.5>
    texture {Layer1 scale 0.1}
  }
  sphere {
    <0,0,0>,1
    translate  <0.8, -0.6, 0.3>
    texture {Layer2 scale 0.1}
  }
  texture {YellowTransparantColor}
}
object {Group}
//------------------------------------

But this does what I want (see the image):
//------------------------------------
#declare Group =
union {
  box {
    <-1, -1, -1>, <1, 1, 1>
    translate  <-0.3, 0.0, -0.5>
    texture {Layer1 scale 0.1}
    texture {YellowTransparantColor}
  }
  sphere {
    <0,0,0>,1
    translate  <0.8, -0.6, 0.3>
    texture {Layer2 scale 0.1}
    texture {YellowTransparantColor}
  }
}
object {Group}
//------------------------------------

Thomas

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Preview of image 'layeredTexture_test.png'