I would be shocked if there was a single item in Skyrim that doesn’t have a new texture/mesh/model/etc (or 50) provided by mods. Some of these target one specific thing, while many are collections. A few things to keep in mind:
If you have multiple mods that add textures/meshes/models/etc to something, whichever “wins” the conflict will show up in game. (This is really where loose and packed BSAs matter because loose always win over packed.)
If you have a lower end computer, you may want to consider choosing lower res options (1K and 2K) instead of the high res options (4K and 8K). Things that you see often and are larger (like mountains) deserve higher res, but things like bees and potatoes, I suggest maybe considering 1K/2K. Unless you really want to have high res bees. Or you have a top tier computer.
There are WAY more mods out there than listed below. These are just most of the ones that I use or have used.
The following will not be found on this page because they have been included in their own mod category page:
These authors have put out some seriously amazing retexture mods that I always use at least a few from each in my playthroughs (And for those that are still producing new content, I also track these mod authors so I can see what new stuff they come out with!):
I’m sad to say that this talented mod author passed away in January 2020, but his work will continue to bring joy to many modders for years to come. Check out the very nice message his grandson has added to the About Me page. And thank you to Shad0wAng3l09 for porting many of his mods to SE!
Please remember to endorse any mods you download and like, and if you appreciate all the hard work that goes into creating a mod, consider giving kudos to the author on Nexus as well (the Give Kudos button can be found on the user’s page).