Extra Game mode
I personally love playing on summoners rift, so when riot came out with Blitz I was about as excited as I was for Dominion and Treeline. To me it feels like I am just playing a worse moba, but I have an idea for a stress free alternative to normal 5v5.
You customize your own champion in the profile page picking from a list of pre made character models, passives, skins, abilities... the whole nine yards. You then save the champion and queue up in the build-a-champ queue with your friends and play your champion. I think just adding the toolbox spin to league would be a fresh enough spin to be a fun alternative to the ranked grind.