I thought I heard something about this, does such a mod exist?

Something like this? http://www.tesnexus.com/downloads/file.php?id=40367

Aye, I know what you're asking for. There were some guy a while ago who had remodeled Cyrodiil with exotic like environment, think he had made the cities match as well :rolleyes:

The Enhanced Vegetation mod might do the trick as well.

This is actually a pretty good idea. I mean, the area around the IC, at least, is supposed to be a jungle, isn't it?