> The others have give you good advice. But, how about a simple way.
>
> box{-1,1 pigment{boxed color_map{[.1 Red][.1 Blue]}scale 1.01}}
>
> or have I missed the boat?
Your example is red on the whole surface of the box.
Other sized boxes will have at most two sides that
have a blue field with red outline using that pigment.
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