MVP system
I think the game doesn't properly reward exceptionally good play, in the sense that whether you single-handedly won the deciding team fight or were just along for the ride the entire game you still get the LP for winning. So I think it'd be a good idea to add some form of MVP to every game (possibly to both teams), where the MVP gets a little loot bag that gives some blue essence (or if you're lucky some orange essence maybe?). I think Riot has enough data and enough smart people to make an algorithm to determine MVPs with enough statistical significance based on different statistics in the game, and I also believe that it's a nice authentic way of earning more in-game currency.
: You are garbage Shyvana!
: Whatever trash can, I going for MVP!
: Guy's it's okay just play.
: Wait we have 2 junglers? (Only 10 min in before she noticed)
: All: But she carried?