I'm not even sure how many people still play this game, but I'm going to make this thread anyways.
When I first started playing the game I just wanted to play it. I didn't focus too much on what I wanted changed. But as I play I get fed up with some of the stuff they changed and how much the game lacks in terms of Morrowind. So when I come across a nice add-on, I'll be posting it in here. Others are welcome to as well.
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Dark UI:
This gets rid of that terrible console-feel UI and replaces it with a darker, Morrowind-ish UI. The compass, health/magicka/fatigue bars are MUCH smaller and are a little transparent.
The map of Cyrodiil is given a much larger window, allowing you to see more of the map then you previously could.
The character, inventory and spell book menus use much smaller text as well as bigger windows. You're able to see all major and minor skills now without scrolling, whereas you were previously only able to see about 6 or 7 skills.
This just makes the game easier to look at cause the big clunky UI is no longer there.