Funny you should suggest that; different monochrome colors for zones/dungeons were originally planned, and the shader supports it, but it fell out of scope for this game. I agree though, it'd look cool in the right game.
It could be like a 3D version of those old 8-bit games from the 1980s/90s. A forest could be green only. Nighttime could be RGB(0, 0.5, 1.0) :)
