[setr]

I just despise the fact that you can’t go back from login to the wallpaper, because I always end up processing that the image was interesting after the going through the motions

[sshine]

My login screen wallpaper stays as the background wallpaper. I find this very enjoyable.

A lot of Linux login managers (e.g. slim) make this the default. So all you need to do is cycle the picture that the login manager references.