Checking the Nexus, there are some jungle Cyrodiil mods:
http://www.nexusmods.com/oblivion/mods/45974/?
http://www.nexusmods.com/oblivion/mods/45960/?
http://www.nexusmods.com/oblivion/mods/31000/?
These are just some I found off a quick Google search. Never tried them though since I don't have interest in Oblivion right now.
Considering Morrowind, I only recently used a better face mod that stays in line with vanilla faces, giving them a much nicer, more updated look. Also been using Morrwind Comes Alive to get some random people in the world that walk around towns, drink in taverns, and try to kill me in the wilderness. Only thing I don't like is the clothing mod for one of them since it sells some armor more in line with Daggerfall (A tabard shouldn't be heavy armor with 80 defense, especially that is nothing more than some cloth worn over armor. Do like how it can make a for an easy fast buck in selling).