You might find some good ideas in the section on "The Greatest Commandment" https://www.rotation.org/forum/the-great-commandment
Cooking
For instance, this lesson set on The Greatest Commandment, from FUMC, contains a cooking lesson where you make heart-shaped cookies and then share half. Perhaps that could be adapted to a lesson on the Golden Rule.
Video
Animated Bible stories for children from GRACELINK (Primary videos ages 6-9, maybe even 10). 1QD Lesson 1 - The Golden Rule. See this link for more details on GRACELINK's videos https://www.rotation.org/topic/550185852432642536