I think it would be awesome to have the effect of Colorflow (a jailbreak tweak) in Spotify player built in. It looks beautiful, and altho it could not be on the lockscreen having it inside the app would be slick. The best thing is it is just less than 50 lines of additional code. The attachment is a screenshot of how colorflow works. It takes dominant colors of an album and makes the player UI in that color. Isn't it beautiful?