Shading faces depending on orientation Newbie here with possible strange request.

I am learning anatomy, currently by studying a 3d skull.
I would like to lit it in some ways, so that the faces facing front would be in a certain color, the faces facing left in another, the faces facing right in another.. you get the idea.
This would come with some threshold i guess: lit faces that are x degrees facing front for example.

I guess that i would have to dig into creating a shader to do so? Maybe with the normals? 
Maybe what i want is not possible?

Thanks in advance!
Y
If you want it to look like lighting, you could just use colored lights? 

But to shade the surface, you could use an arrangement something like this .. 

 

.. which is quite tweakable .. It would depend.. how do you want the colors to be combined.. as @moonboots asked, do you want the colors to be stuck to the surface?