Free Art Lesson Plans - Still Life Set Ups
This isn't a sub lesson, but it might be helpful to you at the beginning of the school year.
When I am teaching contour line drawing to my fifth graders, I lie to use still life set-ups that include objects familiar to the students. That age group is not that far from the age of sleeping with stuffed animals, so I find that they feel comfortable trying to draw them.
I put together a small collection of public domain photos in PowerPoint that would work nicely as still lifes for elementary drawings. You might use them all at once in a lesson or save them to show individually as warm-up exercises.
If you would like to have a copy of the PowerPoint, you may download it for free at my TPT shop: