We were able to complete these in one art class. Here are a few samples of our work:
First we created the background sky with chalk pastels. Students were instructed to use 2 different colours from the set choices of different shades of blues and purples. After using their fingers to blend all the chalk together we used black oil pastel to draw our bats. They were encouraged to press hard enough to create thick solid lines and a round shape for the head.
Next they used their fingers to pull the pastel away from the shape to create a fuzzy effect. Then they did the same to the lines in the wings. Some were more successful at this than others but they all look adorable.