Kids get a kick out of Mo Willems’s books. I was at a bookstore once when there was a reading going on of Don’t Throw the Pigeon from the Bus and kids were eager to shout along. His books are wonderfully simple in text and drawing style, yet full of clever humor that appeals to young ones. Now there’s an app called Don’t Let the Pigeon Run This App in which the child can insert his own thing he doesn’t want the pigeon to do.
You can purchase it here.