For a fun and easy tactile project, students researched high contrast images online of the subject of their choice. Then they printed out a favorite, and cut away the darkest or the lightest areas. What remained was a spray paint stencil. If the light areas were removed, white spray paint on cardboard would replace those areas via the stencil. Some of the darkest areas, or just the back ground shapes, were outlined with an X-Acto knife and then the top layer of cardboard was peeled away, revealing the corrugation.
Some images were done by painting book board, and gluing parts of magazine pages onto the board before reusing the spray paint stencil. This wasn't as tactile, but still made for some interesting visual effects.