You could have students share out main ideas to get started.
1. Each student chooses a COLOR and states why this color represents a main idea.
2. Next each student chooses a SYMBOL that represents a main idea and states why.
3. Lastly, each student chooses an IMAGE that represents a main idea and states why. The image may be a sketch, or a photograph.
4. Share with a partner, small group or on a google presentation for a large group share.