Pick some people and make quick notes about them - how did they look, what were they wearing. These are fun to write (remember to let them read lots of comics as research! There are several online programs for making comic books.
You can use any of the lessons individually, teach them together as a course, or combine them with a workshop format if your students are at an age and level where they can handle group critiques.
Here's a complete creative writing syllabus with writing lesson plans, activities, and exercises for the teaching of fiction writing.
Homeschooling is wonderfully flexible - and there are some great ways of encouraging your children to write.
A great way to get your kids writing is to make use of your daily newspaper.