I posted the two sizes requested in comments for the airport wallpaper last comic. If you’d like to make your own, feel free to resize the larger version to fit your needs.
Also, I can’t see any evidence of Society6 creating calendars I can sell, and I know calendars are a bit on the ‘goofy novelty’ side of merchandise nowadays…but I got an idea for one. Its been pretty well received among the friends I’ve asked, so I’d like to know if anyone is aware of a site or company that makes them. I need to know how large to make the images before I can start.