I'm not going to lie, when i saw Eloth mention trees and flora as something that needs to be done I took a big sigh. However, after a few weeks of practice I thing I've got a good technique down, although there are still a lot of kinks to work out. I never beleive in exporting anything to my precious Skyrim installation unless it's finished and clean. So getting straight to the point, I would like to show some screenshots of what I've been working on.
First Attempt:

[External image]Pretty bad huh? Well it get's a bit better thankfully.
[External image]Still kind of bad but after some sculpting it comes together.
[External image][External image]Hopefully I'll be able to export these(after some poly reduction) into the game. But I posted this as a way to get some kind of feedback on what I'm doing, maybe I should just edit the existing trees instead making new ones. I feel as though adding new trees will make that Morrowind forest environment seem more diverse and organic. Let me know your thoughts.


Doing it by yourself might be
Doing it by yourself might be daunting, why not make more specialized trees like you have now. and for the rest use existing modders resources on skyrim nexus then modify/retexture those. One of the tree authors has already authorized usage of his mod in skyblivion. this would allow you to keep on adding unique and morrowind esque trees. and also modify existing new resources to save yourself some time.
Personally I like the work you have posted. :)