It would be fun to have a new gameplay and I don't know if it would be possible but here's my idea:
Infinite Jungle: In this gameplay, there's no lane, just jungle!! no turrets, just more monsters(and epic ones). 6 inib(3 each side) and 2 nexus.
This is actually a pretty cool game mode idea ^u^ 100% support 
from me~
One more idea: to replace turrets, u need to defeat particular monsters to be able to destroy the inibs and the nexus
It seems like a good idea
However the problem is that there needs to be a constant supply of players who are willing to play this game mode, otherwise people would be in very long queue times just to get in one game (Kind of like what is happening right now in dominion, where it usually takes 5 mins to get into 1 one game).
Maybe this would be a good idea as an option in custom games, unsure if it is healthy for matchmaking, unless there are people who really like the game mode. (Maybe riot should introduce this in custom games and if people like it they can introduce it to matchmaking, kind of what they did with ARAM)
