I've been wanting to get more into modding lately, and I learn best by analyzing examples, so I'm looking for some examples of especially well-implemented mods that I can learn best practices and higher-level design from - I already know basic lua and programming, I really just need examples to dig into and play around with to get me up to speed.
UI-heavy mods would be especially helpful, as that's where my current interests lie, but anything you consider to be a good example of modding code would be hepful. I'm aware that can be subjective, but that's why I'm asking here instead of trying to determine that on my own. Your opinion is what I'm looking for, not objective truth.
(alternatively, if you work on a mod and have some good small tasks for a modding newbie with pretty good general programming skills, those would also be welcome as excercises

Thanks!