Free e-curriculum offered at CurrClick, "Your one-stop shop for electronic lapbooks, affordable curriculum, and homeschooling resources. Unit study, novel study, bargin home study online downloads for home education!"
Also at CurrClick, although not free, it looked interesting. We might try this: Ignite Your Writing: "Multi-level writing curriculum offers 24 lessons covering 6 areas of writing skills needed for any kind of writing. Each lesson has 3 levels: Startup, Intermediate, and Advanced. Choose the level based on the student’s writing ability rather than age or grade." On sale for $10.00. See the preview at the link. I liked what I saw, and it seems to complement what we are covering in Rod & Staff's English(sixth grade).
Free ebook over at Google books for developing writing skills: Lessons in English 1 and Lessons in English 2 by Fred Newton Scott and Gordon Augustus Southworth.