You might want to provide paint shirts or other upper body covering to protect clothing from the powder.  It is easy to clean off hands using just a damp wash cloth.

Sprinkle some baby powder on a smooth table surface.  Encourage the participants to run their finger tips through the powder and make designs.  Assist in printing their first name in the powder.  Ask participants to rub their hands together to feel the smoothness of the powder.  Talk about the sweet aroma of the powder and how it is the familiar fragrance of a baby.