Here's another "marbleizing video demonstration with vibrant colors and a variety of results. The artist notes that shaving cream is a wonderful "sensory" material (feel and smell) that heightens the experience and memory.
Unlike some other "demos" you can view online, this artist doesn't first smooth out the shaving cream, but rather, dribbles the paint on the relatively uneven spread of shaving cream AND THEN swirls it in.
The "notecards" she creates could have a Bible message written on them AHEAD OF TIME using permanent pens, then "marbleizing" them with colors and shapes that represent the story you are teaching.
Key: Don't over-swirl or you will end up with brown paint!
Tip: If you use primary colors, when swirled they can combine to create a secondary color (blue + yellow = green, for example)