I think it would be cool to have character-themed background music. These could be purchased like alternate skins for unlocked characters, and played instead of regular background music.
As I write this, I realize that music is a lot more piracy-prone than skins. Then again, if creating the music is not too expensive, maybe it would still be worthwhile.
Could you tell us if it's something Riot is willing to consider?
Thanks, and awesome work!
© 2014 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.