Team Base Theme/Skins
It would be cool if players could purchase themes for their base and towers as a skin in the store for RP. There could be themes like Freljord, Bilgewater, Zaun, Shadow Isles, etc..
Allied inhibitors, allied towers and nexus would all have a different look based on the theme selected. Buildings and towers would have different animations (kind of like how the bilgewater map's towers have a different animation).
It would be pretty cool to change your allied minions with these themes.
The themes would work like this:
Cost around the same price as a Ultimate character skin
Players will choose a theme in champion select, next to the skins tab.
If more than one player has a theme on the same team, those players would choose their desired theme and a vote will be casted in champion select. Kind of like how the switch function works, except it would show the theme icons.
If all 5 players have a theme and have selected one to play for that game, it will go to majority or one will randomly be selected.
Just a thought that popped in my head.