Biome Themed Cities

What if the city view changed to reflect the biome you are located in? I'm currently located in a swamp, but when I go into my city, all I see is bright green grass and clear water. Instead, let me see the muck and algae and all that fun .
I'll be honest, this adds nothing functional, but it would be cool, and a little more immersive. There might be a way to tie function into it, as well.