Picture books written for kids ages 6 - 9 years old, lots of these books have more text or more complex concepts involved.
Stories with animals as main characters
FROM THEIR WEBSITE:
"The statewide Battle of the Books program is designed to promote a love of reading among our students. It encourages students to read a variety of books and remember information about the plots, characters, and settings of the books. Every question asked in a battle is answered by the title and author of the book and takes the form of: Name the book in which a horse and a boy are stranded on an island. It is a fun, academic-based competition that has been very successful in school districts throughout the state in encouraging students to read."
Holiday and celebration books including 4th of July, weddings, Groundhog Day, as well as various other holidays
Picture book series such as Berenstain Bears, Froggy, Clifford, Curious George, Pete the Cat
Including numbers, letters, seasons, shapes, sizes, patterns, and more
Classics, including favorite authors (Mo Willems) and award winners (Caldecott, CSK, Pura Belpre)
Folk tales, fractured fairy tales, new takes on folk tales
Cars, trains, trucks, also robots
Milestones like potty training, big kid bed, relationships, friendships, emotions and emotional control books
Realistic stories about nature, wild and domestic animals, particular seasons, being outdoors
Nursery rhyme books, songs turned picture book
Realistic and fantastical books with people or objects as main characters