This lesson has been around for ages. I have seen it called many different names over the years with variations on the same theme. The results are always completely different from student to student. I do this lesson at the beginning of the year to introduce line and primary colors.
The idea is that you give the class a set of instructions. They follow the instructions and the drawings are created. Once complete, students fill them in with color.
Each time I do this lesson, I change the instructions. Instructions would be something like: draw 2 straight lines anywhere on your paper. One line must extend off the paper. Draw a circle anywhere on your paper. It must touch one of the straight lines, Draw three dots on your paper. Draw a curved line that extends from one of the dots. Draw an angled line. Once they have finished the drawings, they fill in the drawings with paint.