A more active Ranked League.
As of now, individual ranked leagues are pretty pointless, right? So I had this idea for Ranked Queue that gives you an option to prioritize other summoners in the same League as you when matching you with teammates. When you select this option, matchmaking will try to first match you with other summoners who are in the same league as you who have also selected this option. I think this would make solo-duo queue more enjoyable and promote team cooperation, since fellow league-mates will likely be more sportsmanlike.
You could also make an option for this in 5v5 ranked modes, maybe call it League Battle or somesh*t. You get matched with 4 other people in your league and your team faces 5 people from a different league of similar rank. For example, since I am in Akali's Assassins, My game would be Akali's Assassins (my team) vs idk Jayce's Cavaliers. A leaderboard of the best leagues in each division would be cool, right?
I've always thought that League was a great team game where no one feels like being a good team mate, the irony. People fight over roles in champion select and cuss each other out over mistakes made in game. When you do find those sportsmanlike players though, you have **great **games. I think changing this will create a better team-mentality in ranked. Thanks for reading :] Skyewalker