In the "Profile" page, the splash art of the champion that has the highest mastery score is set as the background. It would be really cool to have the splash animation of that champion be the background instead of just the image. I don't know if all the champions have a splash animation but if they do then this would make the client really immersive,
This board is the best place to discuss the client with Rioters and your fellow players, although it won't be our main source for feedback resolution. Look to the other tools, like the Submit Feedback button in the client, for that. As always, please follow the Universal Rules and keep content focused on appropriate topics for this board.