This is such a fun image of all the organs in the body. Not to mention, this site is a perfect resource for providing fun images of the different body parts. CLS could print out images and use these when educating children about organs and the body.
Circulatory System Lesson: any way to get children to understand something that is difficult to understand is always effective. This activity can be a part of helping a child understand how their heart and circulatory system works.