Measure two equal-sized squares of construction paper. Choose different colors of construction paper or use one color.
Draw a diagonal line across each square. Cut on the line about two-thirds of the way toward the center of the square, without cutting through the center.
Place one square over the other. Fold each cut tab of the construction paper square toward the center.
Secure the ends folded into the center with a straight pin. Place a bead through the other end of the pin on the back of the windmill.
Push the end of the pin through a pencil eraser. The children can hold the pencil and watch their windmill spin.