Paint the toilet paper rolls in your chosen colors. Allow time to dry.
Cut the toilet paper roll into strips to form the light bulbs.
Glue the “lights” onto the cardboard. Arrange them so a string of lights would lay if spread out on the surface. (You can draw the cord first if it’s easier.) Allow time for glue to dry.
If you haven’t already, draw the cord connecting each light with the black or green marker.
Place the matching pom poms in various containers.
Have the kids scoop pom poms into the matching colored lights.