That's a hard one. I always fell in love with books for their illustrations, and not the writing. Illustration was my major throughout college.
My first book that I can remember having my mom read to me repeatedly is Bembelman's Bakery.
I remember I loved the illustrations, and the stories was similar to Cloudy With the Chance of Meatballs; in the fact that food took over the town. In this story it was bread dough that took over.
As I aged I didn't want to read thicker books. Mainly because they didn't have pictures. In third or fourth grade my mom got me into The American Girls series of books. Kirsten was my first doll, and series read. This was before they became super commercialized. Back when they only had history stories and dolls. I liked Kirsten because my Great Grandma on my Mom's side had a similar story to her. She came to America from Sweden to. Her name was Britta. I was sad when The American Girls Collection started making dolls that looked like modern girls. It was more about the dolls and commercialization than it was about history, good craftsmanship, and the love for reading.
A librarian said some pretty mean things to me that made me rebel to read bigger books. Maybe it was the way she said, "You're too old to read books like this!" holding up a picture book. I was in 5th grade when I was still checking out books with pictures. My teacher in 5th grade changed all that by saying, "Alissa you can make pictures in your imagination." She was super nice. After that I was reading 500 page novels. I read all the time!
To this day I still go to the children's book section at the library to look at the illustrations. Yes I read bigger books now, but I love to see the pictures in children's books.
What book got you into reading?