I posted this on the TV show thread, but someone posted her ideas for actors at https://www.pinterest.com/jaydiarae/fan-cast-the-demon-accords/ .
Also, I’m not an artist, but I’m a web/graphic designer and I’ve come up with shirts for my personal use from the series. I’m happy to send John the files so he can add them to the store or (with permission, of course), I’ll add them to one of mine with no markup.