You’ll be able to choose what champion is your profile background soon
Riot is now adding the feature to let you change what champion shows up as your profile background to the League client. The new feature should make it on to the Public Beta Environment soon and then go live after some changes come through.
Not too much information is given in the PBE board post for the feature, but from what we can tell, it seems like you need to own the champion and skin in order to use said splash art as your background. The new feature is pretty self explanatory after all.
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