This is a craft I LOVED to do when I was younger!
Take a cereal box and cut out a square.
Have the child take colorful crayons and color in small areas til the whole page is covered.
Then, have them take a black crayon and color over the whole page. It needs to be totally covered, no color showing through.
Next, take a paper clip and bend out an end so you have a point...
Now they can doodle on the black and the colors will show through!