Aside from the mini-article series on option parsing modules that I have recently completed, there are two more series I currently have in mind: one on object systems (Moose, Mouse, Moo, Mo, Object::Tiny, Class::Accessor, and so on) and another on Dist::Zilla plugins. However, as I don't feel familiar with many of the modules or plugins, I think it would be nice if more people could write the articles.
The format of the series is 24-25 (mini-)articles, each comprised of minimum 250-300 words, 3-5 paragraphs. This is equivalent to the amount of text of a typical essay one is expected to write in a TOEFL test in 20-30 minutes time. So it should relatively easy to write even for non-native English speakers. I personally find that writing a blog post in 30-60 minutes time is ideal: it can be done in one sitting and does not take too much time to interrupt your daily work. It can even be done during a break. There is no maximum length limit.
Each article should discuss or review a single module. Ideally the author of the article is not the author or (co-)maintainer of the reviewed module. The article should first describe the module (its brief history, popularity, position in the CPAN river) then proceed to discussion on the user interface and design of the module and finally close with the author's overall view on the module (whether the module is well designed, whether the module is useful to her, whether the module is worth using compared to other modules).
If you are interested in collaborating, please contact me at perlancar gmail. I expect the series on object systems to be posted on Feb 1st, 2017 and the series on dzil plugins on Apr 1st.