One of the many modern-day pursuits of Earthbound / Mother creator Shigesato Itoi is creating planners, or "Techos" as they're known in Japan. His company Hobonichi makes many of these useful items, which can be used as a diary, notebook or scrapbook.
Hobonichi has had plenty of success in its native Japan with such books, and Itoi is now using his game development past to bring them to a whole new sector of the market.
In short, Hobonichi is making Earthbound / Mother-themed Techos. Last year there was an Onett version (there's a video at the bottom of the page showing it off) and Hobonichi has confirmed that the Saturn Valley and Cast variants are coming soon.
As you can see from the photos below, these planners incorporate artwork from the famous Nintendo series: