This first grade project can work for many age levels. Although the process can be time consuming, the results are beautiful.
Have the students fold their paper hot dog, then hamburger (in half one way, then the other)so that there are four sections on equal size when the paper is opened. In one section, draw a design. Have them keep it simple and open. the design should touch the edges of the folded area. Draw over the design with black crayon, pressing down hard. Refold the paper so that the crayon area is facing another side. They should be able to see the image through the back of the paper. Trace over the image through the back of the paper with pencil--press hard. When you open the paper, you will see the image has been transferred. Continue folding and transferring until the image is on all four sides. Retrace the lines with black crayon, fill in spaces with lines of crayons in multi-colors, then paint over with watercolor. Voila!