Shaving Foam is a brilliant resource to use and relatively cheap too. Although Adam isn't a fan of touching the shaving foam he will do if cars are involved. We created a Shaving Foam Car Tracks Tuff Spot to explore the shaving foam and paints.
(Sense of touch) put different objects in balloons and have the children guess what each one is. Then, open them up to see what it is. (Tie with elastics so it is easier to open.) To further the lesson, make a chart of prediction and result.