How about "Block Vision 2.0"
Basically a client side add on.
When toggled it will set your..."vision" to night vision.
Then you can change the "vision" with toggle keys.
The visions are,
1.night vision[Lets you see better in dark maps]
2.infrared vision(thermal)[Shows players, and bots as red/orange/yellow "blobs"...to make it seem like they have body heat...]
3."Beast" vision[How do I explain this......basically like infrared but with "beastly" lines on the edges of the screen...I've seen it in a Far Cry game i think......]