BlueMoonDreams - the requirement for the customs to be featured is that they must be story-based (I'm an author, so I wanted to keep my blog focused around stories, even the ponies). Most customs people make based on stories are from movies rather than books, so that's why there are a lot of movie-based customs
This week's custom is Wednesday Addams, by Woosie:
http://rebeccaenzor.com/2013/02/17/custom-of-the-week-wednesday-addams/