Garen idea
So ever since they 'improved' the adc items, Garen kinda got unintentionally thrown back under the bus. That and the upcoming nerf to steraks means that Garen will have to revert back to the traditional full tank Garen. This means building items like sunfire, thornmail, etc.
So what I was thinking was to change the passive on his E.
Instead of reducing their armor by 25%, you could turn it into a passive that acts like press the attack, which makes the target take a certain % more damage from all sources, which would also include Garen's ult. Obviously it shouldn't be 25%, maybe make it like 10-12%, but the idea is to again, make Garen an actual threat, instead of just a walking meatshield that soaks damage.