I haven't used the shaving cream marblizing but I have used shaving cream for
designs directly on the tables. I would say it's too exciting for that many
kids in one room. You could do stencils or I have sponge shapes cut for
stars, trees, and 3 circle sizes to make a snowperson, another sponge for the
hat. Put paint out on paper plates-spred paint out flat for printing.
Good luck! Sounds like a wonderful thing to do! Gail.