TheoTown

This is a very simple shader plugin, which adds 4 shader options:

"Noir" - basic black-and-white shader.
"Noir (HC)" - black-and-white shader with more contrast, looks a lot better.
Bonus:
"8-Bit" - 8 bit shader, only 2 values for each channel of RGB. (looks deepfried)
"X-Bit" - like 8 Bit option, but with more possible colors. (Not sure how many bits is that)

If you have any suggestions/problems, please tell in comments. I may slightly change the color, contrast/brightness/etc. in future.

Notes:
Preview shows "Noir (HC)" and "X-Bit shaders".
You need to enable the shader in settings (graphics tab) after installing it.
I will post this plugin on forum (with code) under the same name, so you can install it for free or see how it works.