No doubt you all already knew this, but I just discovered it last night:
How to make a colored shadow with white light.  There's probably other ways
to do this with light_groups and the such, but I think this makes a pretty
easy way.  Note:  If the object statements are reversed (i.e. the
no_shadow'ed object comes before the no_image'd object), this doesn't work.

Also, anyone know what the white stripe is in the middle of the shadow?

object {
 top_box
 no_image
 pigment { NewMidnightBlue filter 0.95 }
}
object {
 top_box
 no_shadow
 pigment { rgb 1 }
}

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