Newspaper or brown craft paper
White paper or construction paper
Food coloring
Plastic drinking straw

Cover a work space with newspapers. Place white paper on newspapers. Put a large drop of food coloring in the center of the white paper.

Holding one end of the straw above the drop of food coloring, blow through the other end of the straw. How hard you blow determines how far and how fast the drop of coloring moves. After blowing the 1st drop of coloring as far you want, do the same with more drops of color.