Step by Step Homeschooling has written a post with ideas to compliment the book Blueberries for Sal.
Itty Bitty Bookworm is a fabulous preschool curriculum that has integrated lesson plans using Blueberries for Sal.
The Blueberry Council website has a blueberry math worksheet printable.
Scholastic has a "Gone Picking" blueberry activity to practice numbers and operations.
Counting God's Little Blessings has a Blueberry Jello Salad recipe that sounds delish!
Hands of a Child also has a K-3 Literacy Packet to accompany Blueberries for Sal.
Have you read the poem Blueberries by Robert Frost?
Martha Stewart suggests using corks to create blueberry prints on fabric. Cute.