Syntax is like this:

---START CODE---
//This macro defines the shape, it should be defined before using 
GreebledPatch(..)
//and redefined everytime you want a different shape
#macro PatchAt(U,V)
    #local R=[Surface-definition in function of U and V];
    //for example, a cylinder from y=0 to y=1 with radius .2 would be:
    //#local R=vrotate(x*.2+y*U,y*360*V);
    R
#end
mesh {
    GreebledPatch(U_Start,V_Start, U_End,V_End, RecursionDepth, 
Recursion_U_Probability, Recursion_V_Probability)
    uv_mapping
    texture {YourTexture}
}
---END CODE---


Hope you like it :)

cu!
-- 
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x)            // ZK http://www.povplace.com

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