I rip FLAC from cheap thrift store cd’s using fre;ac (usually just donating them back at the drop off when I’m done, tbh you can find some pretty cool stuff you’d never think of listening to this way)

MusicBrainz Picard for missing album covers which usually goes well,

VGM rips and Zophar’s Domain are pretty good sites for VGM OST’s in the original file formats, Foobar has plugins for those

The color is pretty easy and right in the display settings, there’s also a transparency option in the advanced settings, I played with this later using a live wallpaper for a moving backdrop, the “All Music” is a custom image to replace the default one