I while ago I wrote a macro for lightnings .. I'll see, if I can find it again ...

here is a pic I did with it ...

--
background{rgb 1}camera{location<1,5,-2>look_at 0}#macro m(a,b,i)#local d=(b-a)
/8;#local e=vcross(d,y);#if(i)m(a-e,a+e+2*d,i-1)m(a+e,a+2*d-e,i-1)m(a+3*d-e,a+e
+3*d,i-1)m(a+3*d-e,a+5*d-e,i-1)m(a+6*d-e,a+e+6*d,i-1)m(a+8*d-e,a+e+8*d,i-1)#else
cylinder{a,b,vlength(d)/3 pigment{rgb 0}}#end#end m(-4*x,2*x,4) // Jan Walzer

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