Home journals: a year's worth of writing homework. This is a primary example, but I could use my tictactoe homework as the prompts. I like the idea of having all the homework in one journal. easy to show parents, check for completion, etc.
A bulletin board twist to the common analogy ~ writing a paragraph is like making a great hamburger: you need a top and a bottom bun (opening and closing sentences), with lots in the middle (the details/body).