Spells that I would love in Skyrim.
-Mirror Image, Creats x copies of your character. The copies do about 25% damage you do, and can be taken out with one hit.
-More creative damaging spells, ie:Acid Arrow, it'd be different means to the same end, but it would atleast look cool, and be awesome for RPers.
-Polymorph, where it changes a target creature to a sheep or some such. The target would change back whenever you attack it, but it would be great for crowd control.
-Arcane Eye (would deplete magic for every second you use it) being able to see ahead of you would be great, but there would be limits.
-Slow, this might be overkill for archers, but it sounds like a good idea
-Slow Fall/Levitate, Skyrim is full of mountains, plus how great would it be for dungeons to incorporate places you can only go with levitate?
Just a thought, what would you want?