The starry sky of "The Butterfly Effect" could not have been accomplished in colored pencil without the Icarus Drawing Board. The choices would have been to painstakingly draw the blue sky around the white of the paper or to paint masking fluid over hundreds of stars. Instead I came up with the following technique:

Step 1: I laid down several different blue Neocolors II on the warm zone.
Step 2: I used a gray paper stump to thin and blend the crayons on the warm zone. This is accomplished by making small circles with the paper stump while cleaning the excess wax with a paper towel.
Step 3: I kept on working until the colors were evenly blended.

Step 4: I grated a blue colored pencil on a sand paper block.
Step 5: I shook the blue speckles over the crayon background.
Step 6: I grated a white colored pencil on coarse sand paper.

Step 7: I shook the white speckles over the crayon background.   
Step 8: After placing a sheet of tracing paper over the colored pencil speckles, I pressed down with a brayer on the warm zone.
Step 9: The speckles melted into the blue background and created a starry sky effect.

For another example of "speckling" see Snake River Pebbles.