The hardest thing I've found to do is to get my students to write using vivid, sensory words. In this offering is a writing workshop that centers around a "potato chip" comparison activity. Using this comparison to generate adjectives that the children can then use to put into their own writing is the main thrust. Using the phases of the writing process to develop, polish, and present that writing is the main goal.
To that end I've created rubrics for narrative, descriptive and persuasive writing as well as one for the presentation itself. There is also included a descriptive word list as well as a comparative writing sample.
To engage parents I've drafted a letter that urges them to use the respective rubrics to help them craft and guide their child's writing. The duration can be as simple as 1 day for the activity, to 1-2 weeks depending on the length of the writer's workshop.
I created this using Adobe Illustrator saved to PDF so there are no editable files beyond the parent letter. If there is a call for it I'd consider providing an editable version.
This is my first real paid piece, so suggestions are more than welcome. Future plans call for the inclusion of a full unit plan.