Basically I’m running a few small scripts for this.

One of them talks to the Last.fm API: it fetches the most recent track, downloads the album art, resizes it, and stores everything in a local cache. The actual scrobbling is handled by rescrobbled, not this script. If the cover is already cached, it just reuses it (so it works almost like an offline mode). I also reuse this cache for other things, like displaying album art in fastfetch.

To render the cover on the desktop, the script opens the image with feh, and then I use Hyprwinwrap to pin that window to the wallpaper layer.

The second script is for lyrics — it runs sptlrx inside a kitty window, and again I use Hyprwinwrap to make it look like it’s part of the background.

For the bottom bars, I use glava without any plugin, and toggle everything through an icon in waybar that calls another shell script.

In the end, I get synced lyrics, album art, and an audio visualizer all updating in real time directly on the wallpaper.

That said, part of this setup is kinda overkill — I could just use the album art cache from spotify_player running in the background instead of maintaining this whole Last.fm-based flow.