The massive scale to which the mod scene will go to at times never fails to amaze; currently modder Eloth and some others are working on porting the beloved Elder Scrolls: Morrowind into the Skyrim engine. You may recognize Eloth's name as he worked on bringing Morrowind into the Oblivion engine.
As you may know, while arguably the finest game in the series, Morrowind is pretty damn ugly by today's standards. And while you can mod it, it's often an exhaustive process. So, if this project works out, likely you can just download the single large file and get an even better looking game than Morrowind with 100+ mods.
Plans are also in progress to bring Oblivion into the Skyrim engine, but given how mods often work (that is to say, many never finish, or take forever), it's best to just hold out hopes for this one first.
See Skywind in action below.