This, plus the recent announcement of the Hearthfire DLC, made me think: wouldn't it be cool if you could bring certain children up and then get them to join a profession? Let's say they have an accelerated age rate so they do actually grow up, and then for example you can invite Aventus to the Dawnstar Sanctuary and from then on he lives there, wears the Shrouded Armour and is available as a companion for you.
Another example could be another child, and you let him become a Companion. Then he moves to Jorrvaskr, wears the 'Wolf Armour' and again becomes an available companion. Similarily, a kid could become a Mage or a Thief.
Really, this idea came to me because let's face it, what's the point of having a kid if all he does it sit at home and need protecting? I know it's more of an RP thing, but it would make more sense if they grew up and started working for a faction. I know there could potentially be a lot of problems but it would be pretty damn awesome.