A way to incorporate more lore and region concept art into the game
The amazing concept art for Ionia got me thinking: this really deserves to be more than just paintings on the website for us to observe.
What if you created different versions of the 5vs5 map that were basically the same but had a completely different art theme based on different regions in runeterra. Ionian terrain, Noxian terrain, Zaun city, piltover, bandle city, etc. Then which one you play in could be chosen randomly.
You could make each map functionally identical, although to be honest a few minor tweaks to wall placement and pathing on each map would probably liven things up and keep them fresher for people who have played for years on the same map.