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Riot could creat fun little stages like in the game Rakion. Basically you go through a "level" involving obstacles minions etc. Beating it in a certain time would award you more IP until you have reached the best rank for the particular stage. If I am making no sence (and I probablly am not), just go on YouTube and watch a video of a stage from Rakion.
Just spitballing here guys, if anyone cares to add on be my guest.