Contour line portraits with op art back ground 7th grade

I love the look of OP art but....on it's own, sometimes it can be too plain. We spent about a week on the background alone. Students used sharpies to fill in the checkerboard. We created the circles on a separate piece of paper with a protractor and cut and pasted the sphere on the background. We used a charcoal pencil to add the shadow to give it some depth. The contour line portraits were also done on a separate sheet and pasted. A lot of paper, I know. But, I think it was worth it ;)

Supplies: paper, pencil, rulers, protractor, sharpie and crayola markers, charcoal pencil, scissors