Updating the Rune System
I really like how League of Legends is always changing and evolving, to add dynamic into the game. However, I really believe it's time for the rune system to be revamped. As they are now, we generally just see standard rune pages, and that's it. The problem isn't uniformity though. I could go any other rune pages and still be able to play. In the end, they just DON'T matter that much.
Of course, a complete overhaul would be a nightmare to balance, and would be too much. But perhaps some NEW runes could be added?
For example: Increase Size/ Decrease size runes: While they may have been more difficult before, with the advent of the new elixirs, I feel as though this is easily doable. Specific numbers on how much the size should change can be tweaked, but how cool would it be to have an even bigger Cho Gath, or a even smaller Teemo? They won't be OP or anything like that, because changing model size means that flat stats would have to be given up.
DOT Runes: This could be a cool rune, where you could add a small DOT damage to your autos, or maybe similar to Gromp smite where people who attack you take DOT damage. Again, specific numbers could be tweaked, but I think it'd be a fun addition.
I'm sure the community can come up with even more creative ideas, so you guys can post below on what ideas what you think would be awesome too.