Changing the color of a pixel to monochrom is very simple.
In a pixel shader simply return the color of a pixel as:
Code:
return Color.rgb=(Color.r+Color.b+Color.g)/3.0f;
Example:
only the pixels of the water shader are set to monochrome with this function

The only problem can be to found a suitable SH5 shader or to develop a new shader that act as a post process shader and colors the entire scene 
Quote:
Originally Posted by Illyustrator
You think, that in the fortieth years the World was GREY!? 
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the time was grey, see here