I also heard a claim that such patterns can (marginally) discourage graffiti of the seats. And if branding is a thing you care about, they can reflect some parts of that. London S-Stock trains' seats point to the lines where they run, and there have been Danish trains that straight up feature the old DSB logo in the seat pattern.
This artist is named Gigi D.G. apparently, but their webcomic is called Hiimdaisy, and they did a silly Persona 4 webcomic years ago that people like me still quote to this day. It got a comic dub on Youtube by a channel named Sapphire. I can immediately tell by the artstyle that it's them.