Alternatively, you could create a texture per spline, and use functions to have
it follow the spline with the blobs, but independant of them. The problem would
then be limited to spline junctures.

Just as many times answers lead to more questions, I'm sure this solution would
lead to its own uniques set of difficulties. Anything is possible, the real
question is, "How much effort do you want to put into figuring it out?"

--
light_source{0,1}#macro c(J,a)sphere{0,1pigment{rgb z}scale a translate J+O}
#end#macro B(R,V,O)c(0,4)intersection{c(V,R)difference{c(-z*4x+10)c(-z*4.1x+
10)c(0<7.5,45,5>)}}#end B(12,0z*25)B(8y*4<0,12,50>)          // Batronyx ^"^

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