We are all familiar with the blue and red smite, which can be used on enemy champions.
I think riot could explore this concept more by adding smite upgrades that can be used on allied champions.
When used on a friendly champion, provides the target with a MS buff and a small amount of slow ressistance.
Heals the targeted friendly champion for a certain amount and provides a small boost to health regen.
Provides the targeted friendly champion with a small amount of damage reduction and increases its MR and Armor by x.
Targeted friendly champion gains a small shield to block incoming damage.
The current smite upgrades provide more ganking/offensive power, these could be used for counterganks/giving the jungler some defensive tools.