How to change the backround of a particilar library?

[tom80H]

There’s a feature suggestion asking for such an op… but so far it seems only the OP has voted for this.

Custom background for the main page and libraries root

All is said in the title, it would be very nice to customize the background not only for selected/all movies/tv shows, but also for the main and root pages. Maybe it would be some separate folder from the pictures library, or every registered user can use it’s own background.