I see a lot of attempts on making the settlements come alive in mods such as Rebirth, Balmora Expanded...etc. But so far, I have only seen one WIP of overhauling the actual regions.
Oblivion's Unique Landscapes mod adds a whole variety of amazing locations in Cyrodiil as well as other cool and lore-friendly landmarks. This is a video of some of the detailed landscapes that modders have made - https://www.youtube.com/watch?v=cCxVoyiSVFI
So it may be a big request, considering how time-consuming it would take, but I would really love to see more detail in Morrowind's landscapes. Even if it's only a small portion of Vvardenfell