Oracle bones are a fantastic resource for helping you students to understand more about the logic and history of Chinese characters.
The BBC bitesize website has a fantastic resource for this, with an introductory video and interactive exercises:
Also here, you can show amazing 3D models of oracle bones and bronze inscriptions for your students to interact with: https://sketchfab.com/3d-models/cambridge-ul-oracle-bone-cul52-hi-res-3e3f56b59d27465d87daa3dc20f45449
It is also a fun idea to give students a picture of an oracle bone and have them find characters they have learned and guess the meanings of others. As with the one below, students can find 二、 三 and 早.