Profile Banner Customisation
I'm sure this idea has been posted here before, but I thought I'd refresh the concept into Riot's heads - unless there's a reason they dismissed this.
The profile banner (the one you can change by owning Pulsefire Ezreal, DJ Sona or Spirit Guard Udyr) should be customisable. It could be a reward for Champion Mastery (Level 5), as nothing fulfils that role yet. They could also be bought from the store for IP, as they aren't anything major, just a nice bit of unique-ness to your profile. After having this old man here for too long now, I'm wondering why you can't change it without paying £20 for a skin. Sure, keep the 3 Ultimate Skin ones unobtainable, but maybe they could make separate champs their own banners, or maybe scenery like Howling Abyss, Bilgewater e.t.c.
Just a thought. Let me know if Riot has shut this down in the past.