Here is iso_linear_sphere_sweep with vertices along closed spline deformed with
simple agate pattern. What do you think ?

Here is declaration of spline:

#declare S=seed(10);
#declare cm=7;
#declare Spl =
  spline {
    cubic_spline
    #local St1=2*<rand(S),rand(S),rand(S)>-1;
    #local St2=2*<rand(S),rand(S),rand(S)>-1;
    #local St3=2*<rand(S),rand(S),rand(S)>-1;
    #local St4=2*<rand(S),rand(S),rand(S)>-1;
    #local St5=2*<rand(S),rand(S),rand(S)>-1;
    #local St6=2*<rand(S),rand(S),rand(S)>-1;
    -5,St1,
    -4,St2,
    -3,St3,
    -2,St4,
    -1,St5
    0,St6
    #local c=1;
    #while (c<cm)
      c, 2*<rand(S),rand(S),rand(S)>-1
      #local c=c+1;
    #end
    cm,St1
    cm+1,St2
    cm+2,St3
    cm+3,St4
    cm+4,St5
    cm+5,St6
  }

ABX

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