Art is a great subject to teach. I love trying new projects and I love the freedom to choose projects that I too enjoy making and teaching. Have you found the blog Art Projects for Kids? If you haven't, you should start following immediately. Add it to your Bloglovin list, and you won't regret it!
Kathy Barbro not only gives you great ideas on what types of projects to make, but she even gives step by step instructions. How awesome is she? Also she sells some sets of instructions too, if your interested in purchasing those as well.
Here is a sample of her most recent post: How to Draw a Cruise Ship. Brilliant!