But one thing that really struck me and that used a lot of time was House construction. You could create rooms, and using skills, build your own custom furniture, and make a truly amazing place for your friends to visit. I really enjoyed this feature, and the concept of it all seems to work very well with the sandox nature of a hardcoe RPG like elder scrolls. Homes previously did not feel like homes. Now, it'll be an excellent break from adventuring to go spend your gold on buying a lot in your favorite city.
With the addition of things like mining, chopping wood, and improved hunting, we are going to be getting a lot more raw materials, I think we should be able to construct, even if with very simple tools or harsh restrictions, a nice house.
Fill it with display cases!
Use your intelligence to build alchemical workbenches, bookshelves.
Use strength to build furniture with raw materials.
Or buy them. Construct chests maybe.
Maybe the game could do a check of the PC, and put it into stone so you can put a 50 foot statue of yourself in the lot. Or some busts in the halls.
Another suggestion I would like to make is custom dungeons. While making no sense whatsoever in logic or lore, I think the ability to rearrange premade segments (Hallway, underground river segment) would be great. Oblivion dungeons all seemed to be made of premade segments, and while Skyrim shouldn't have dungeons like that normally, just 1 would be fine if YOU made it. Also should buy randomized chests (Massive gold cost even for a low-level chest) and place enemy creature spawns (do not drop loot, but if you never see more than a single rat or whatever, why not fight in one giant arena filled with nothing but weak monsters that you can crush hordes of?)
While I do not in any way want any kind of multiplayer features in Skyrim, sending a custom house or dungeon to a friend via respective networks would be amazing.