[Q] Black & White Rendering Question

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I know there are several ways to tweak the color settings on the Nexus 4 if you use certain kernels, including the RGB 0-255 values and contrast settings through apps such as the paid version of the Franco.kernel updater. I've fooled around with these a bit, and I like the contrast settings but usually roll back to defaults because they are noticeably dimmer than defaults, which is likely to make me turn up the brightness and use more battery. What I'm wondering is if there's a way to remove all color from the display and use a black and white rendering instead? It isn't out of any necessity, I'm just curious and sometimes like reading certain things in B&W because unnecessary colors in ads or UI elements can be distracting. Any suggestions or advice would be appreciated. Thanks.