Texture improvements. To everything. I want the enchantment table redone; it's lame, corny and ugly. I want dragon armour to not look so stupid; I want glass armour to look less girly; I want dwarven and elven armour to not look so dorky. I want higher resolutions on everything.
Gameplay improvements. I want animations to be more realistic. I want new spells. I want leveling to occur more slowly. I want it to be impossible for the PC to become godlike. I want crafting to be redone. I want for diplomacy (via speech) and stealth to be more viable as forms of interaction.
Animation improvements. I want battles to be more visceral. I want characters to use their weapons more realistically. I want magic to look more magical.
Lighting improvements. Enough said.
Shadow improvements. Enough said.
Quest improvements. I want new the majority of Skyrim quests to be redone to be longer, more interesting, and with better dialogue and/or voices.
Voice/dialogue/character interaction variety. Enough said.
CAMP MOD! Please :cryvaultboy:
Alternate start (though with the cutscene this may be tricky?)
Great ideas.