here's a water surface i was happy with. it's produced with a heightfield
using these pigments. It's probably to "noisy" for something like Bill
Hails tranquill scene, though. 

in the image itself, i used a "pigment { rgbt <1, 1, 1, .97> }", and a
"finish { specular .2 roughness .1 reflection .3}" to texture the
heightfield. Photons were also used. 

it was going to be a scene of a "water moving facility" with down-trodden
slaves doing nothing but endlessly pushing water through for no apparent
reason. but i digress. it wouldnt be hard to smooth this out a little to
make it less "active" so to speak. 

#declare wrink = pigment {
  wrinkles 
  color_map {
    [0.0 rgb 1]
    [0.3 rgb .8]
    [0.6 rgb .4]
    [0.9 rgb .1]
    [1.0 rgb .8]
  }
}  

#declare rip = pigment {
  ripples 
  color_map {
    [0.0 rgb 1]
    [0.3 rgb .8]
    [0.6 rgb .4]
    [0.9 rgb .1]
    [1.0 rgb .8]    
  }
}          

plane {
  <0, 0, 1>, 10
  pigment {
    average 
    pigment_map {
      [1.0 wrink scale <1, 1.5, 1>]
      [0.8 rip scale <2, 2.5, 1>*.6 translate <-15, -3, 1>]
    }
  }
}

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