Whoop! Interweave Press is now offering the Babette Blanket crochet pattern for $6.00. It is a downloadable PDF file so you'll get the pattern right away! The Babette Blanket designed by Kathy Merrick was published in the Spring 2006 issue of Interweave Crochet magazine - and back issues of that issue recently sold out on Interweave's website.
On the Babette Blanket order page, Interweave has also included the complete yarn list, gauge and crochet hook information.
You can also create your own one-of-a-kind version of the Babette Blanket by drawing squares in different sizes and selecting your own colors - which is what I did to design the additional panel for my Babette Blanket.
Because I don't like the join showing on one side of each square, I join in a corner instead (see the photo of the red square - there's no line down the center of any of the 4 sides). The pattern for the granny squares is published as square #3 Square Target in the book "200 Crochet Blocks for Blankets, Throws, and Afghans" by Jean Eaton - AND, it is square #77 in "99 Granny Squares to Crochet" (with this mod: make each corner 2dc ch 2 2dc) by Leisure Arts. There is also an online version of the square pattern called "No Seam Granny Square" at Chez Crochet (scroll to bottom of page).
I also crocheted a Babette-style blanket using solid colored squares and a custom layout.
Create your custom blanket layout using 2-row, 4-row, 6-row, 8-row, and 10-row squares. You can make squares that change color every row and/or every 2 rows or every 3 rows, and/or solid-color squares.
Use these joining instructions for a good result.
Have fun with it - don't feel constrained to make the original Babette! Examples of other Babette-inspired blankets are on the Flickr Babette Blanket pool.