Google Drawings and Google Slides are two of the most underutilized of all of the tools in GSuite for Education. They can be quite powerful once you grasp how to use them. I'm not sure anyone has mastered Google Drawings quite like Darren Maltais, a Technology Integration Facilitator from Canada.
Darren has created an extensive collection of activities that take full advantage of the power of Google Drawings and Google Slides. Activities are organized by grade level. There are activities for Language Arts, math, social studies, and science. Even if you don't find exactly what you are looking for, this collection will certainly help you get some ideas for how Drawings and Slides can be used to their fullest potential.