For some of the spotify made playlist, there are different color gradients while in full screen mode. Apart from the normal grey gradient. If there was a way to have custom preferences for full screen mode, that would make it much more appealing, and be a great thing to have on in the background during a party.
Some of the options could be,
One color: pick a color, and the background is that gradient
Cycling colors: the gradients will cycle through all the available colors
Picture / gif upload: someone could upload a specific .jpeg or .gif and it will be behind the album cover, title, artist.
Different stylized options for the album cover: This one might be more complex, but it could have the album off to a side, then the other side have the artist / title. The extra space could also be filled with some of the gifs from the mobile app on spotify that artist can upload.
I would very much enjoy more options, to have more visual interest at my parties.