Boy, was I ever wrong about trying to use 'waves'. Anyway this here will
make a "starter" for you hopefully. Looked fair enough to me.
Follow the instructions okay and your all set to see this right. Two
step rendering involved.

//BEGIN

// needs to be output as:
//  +fn +w500 +h500 +oc:\images\sanddune.png
// in command-line for making image_map
// then use any usual setting and output to other than sanddune.png to
use image_map

//render square image, example 500x500 pixels resolution if 1
#declare ImageMap=0;  //1 for making image to be used as map, 0 or other
# for seeing heightfield
//render as usual if non 1 number, example 320x240 pixels res.

#if (ImageMap=1)

global_settings {
	hf_gray_16 on  //output a smoothable heightfield image
}

camera { orthographic
  location -10*z
  up 10*y right 10*y
  look_at 0
}

#declare Wave1=pigment {dents turbulence .333 octaves 3 lambda .75 omega
1.5
	 color_map {
	[0,1 color rgb .5 color rgb 0]
} ramp_wave}
#declare Wave2=pigment {bumps turbulence .125 octaves 2 lambda 1.25
omega .5
	 color_map {
	[0,1 color rgb 1 color rgb 0]
} ramp_wave}

plane {z,0
	pigment {average turbulence .125 octaves 2 lambda 1.5 omega .25
		pigment_map {
			[.5 Wave1 scale .5]
			[1 Wave2 translate .25]
	} ramp_wave scale <2,1,.5>*.5 rotate 5}
	finish {ambient 1}
}


#else

//normal view
light_source { <-5,15,-30> color rgb 1.5
}
camera {
  location <0,6,-12>
  look_at <0, -4, 0>
}


height_field {
  png "c:\images\sanddune.png" smooth
 /*
  texture { pigment {
      image_map { png "c:\images\sanddune.png"
	 map_type 0 //interpolate 2 once
	 } rotate 90*x
    } finish {phong .1 phong_size 5}
  }
 */
 texture {
 	pigment {rgb <.85,.7,.45>}
  		normal {granite .025 scale .005}
   			finish {phong .1 phong_size 5}
   }
	translate <-.5,0,-.5> scale <33,1,33>
 }

#end
//END


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