Several years ago I read 3 books in succession that had the word 'bee' in the title. This was just by happenstance and not realized until years later when I kept getting the titles and their authors mixed up. The first was The Secret Life of Bees by Sue Monk Kidd, the second was my book club's selection, Keeper of the Bees by Gene Stratton-Porter and the third was The Beekeeper's Apprentice by Laurie King. Looking back on it, I had an idea that it would be fun to do this on purpose. Well, today I was reading random blogs (because I don't have enough books piled up to read, I guess) and came across this same idea.
Reading Themes is a post listing several different reading themes. Here's a few of the categories: Places, Animals, Months, Pultizer and Garden. I thought the 100 x 100 and 7 books in 7 days both looked interesting. I'd have to read picture books to accomplish that last one! Anyway it's a fun site and an interesting idea. The site also lists some books that could be read in each category.