This may be going a little CoD, but i think it's a good idea.
I think you should be able to customize your armor according to what Armor Ability you are using. (assuming AA's are going to be in H4) This means you could choose different armor for if you were using sprint than active camo, and edit each slot indepedently.
Therefore, your lightweight sprinting spartan isnt going to look the same as when you use a stealthy camo class or an armor lock class.
As for how the armor looks, the ability to change the textures of the material your armor is made of would be sweet (a la Mass Effect 2)
As long as one texture doesnt have advantages over another, (due to visibility) it could be a good addition to the customization of armor and give more variation between players.