Around early 2011, the Mr. Men Wiki had a bunch of pages for "Personal Ideas", which contains information on characters and stories for fan-made continuations and spin-offs, including pages for books (one of them being "Mr. Messy and the Magic Pencil"), and Seasons 3 to 6 of "The Mr. Men Show". Of course, they eventually got deleted and the only one of these that seems to have been archived is this: web.archive.org/web/20110817014229/http://mrmen.wikia.com:80/wiki/Personal_Ideas_for_season_5