I don't know what it is about them, but I find painting Plaguebearers extremely relaxing. Doesn't matter if they're the original ones, the metals from the 90's, the revamped ones from the 00's, or even the plastic ones, I love 'em all. I painted over 100 over the span of a single week.
I still have some of the metal ones from the 90's set aside for my homebrew dungeon crawl.