I don't think that this is the main problem on SM right now, It's just a visual update and it will just feel different for few days, after that, nobody will care about the background or the music, I think that most of the players muted the music.
BUT if something like this happens, I would do a poll/contest for the best background creator, rewarding with tokens and adding the background to the game. (Only adding 1 or 3 backgrounds (First place, Second place and Third place))