This grass may be slow but the code (IMHO) is ingeniously simple!  A
320x 240 took 23 min to render...

#version unofficial MegaPov 0.5;
#include "colors.inc"
#include "textures.inc"
camera {
  location <2, 40,-146>
  look_at  <2, 15, 0>
  angle 30
}
background {SkyBlue}
light_source{<-70,1200,-120>rgb 1}
#declare fnoise=2;
isosurface{
                function{y/190+
                noise3d(x*fnoise,y*.02*fnoise,z*fnoise)/10
                 }
           accuracy 0.01
           threshold .21
           contained_by {sphere{0,600}}
        pigment{SeaGreen}
        finish{ambient 0.2 diffuse 2}
        }

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