Ooops! I forgot!
To the background works, you have to remove that plane you place:

// Here is the modified code
#include "colors.inc"

#declare Cam1 = camera { location<-2,0,0>
                         look_at <0,0,0>}
#declare Cam3 = camera { location<0,2,-8>
                         look_at <0,1,0>}
camera{Cam3}

light_source{<-2,15,-15> color White}

blob {
    threshold .65
    cylinder { <0,0,0>, <4,0,0>, 1, 1 }
    cylinder { <0,1,0>, <4,1,0>, 1, 1 }
    cylinder { <0,.5,0>, <4,.5,0>, 1, 1 }
    pigment { Blue }
    finish { phong 1 }
  }
background { rgb <1,1,1> }

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