Place paint in a shallow bowl or a paper plate. Have the child dip a piece of marshmallow or foam in the paint and stamp it onto the construction paper.
You can let the child create his own picture or if you would like to work on visual-motor skills, you can have the child trace lines, shapes, and letters.
You can use small or big marshmallow for this activity.
For children that tend to place objects in their mouths, you might want to try using Jell-O mixed with a small amount of water and use it as your paint.