If there is not a mod that does this i would like to see one that gives you a way to choose your starting spells. I know that a mod called Skyrim Improved Magic System did such a feat and i played with it for a short while but I didnt like the other features with it. I think it would rather cool to have a mod that only effected your starting spells and allows you to choose from several novice/apprentice level spells (depending on your skill level with that school).

Maybe start without any spells and activate a token/item and then choose your spells from a menu? One spell per school should do fine i think. Even have the option for not picking any spells for that school. Or if you want to play a character who thinks magic is a vile art then just dont activate the token/item. You will then be able to wonder the lands without any knowledge of magic.