This is a very fun, and generally clean playtime activity. All you’ll need is:
- Foam Shaving Cream
- Table with Laminate Surface
- Kid(s)
Directions: Spray some shaving cream on the table and tell the kids to rub it around, write letters, make pictures, etc. all with their hands.
Make sure kids know not to touch their face/eyes, while playing. Clean up is a breeze too. Just rinse hands, and wipe off table.
Do It And How 
used to do this when i was a kid…it’s one of the few things i remember from pre-school! i was amazed at how green gel turned into white foam.