Animated champion splash art
What if Riot would make all the champions' splash art animated. Bring the environment and the champion alive wherever they are. Not too much but at least let the splash art move a bit. Like the Evelyn's loading screen. It would take a lot of time making all the new animations taking that there a ton of skin as well but just think how cool it would be if you are looking at your favorite champ and its not just a picture standing still.
Maybe the next pre season update or the one thereafter.