Not only will your students wil . "LOVE" these Op Art Hearts Coloring Pages, but you can also sneak in some lessons about colors as you have them choose a color scheme to color them in.
Multi-color ballpoint sketchbook drawings from Click through to see more. Ballpoint pen but could easily be colored pencil as well.
watercolor using saran/cling plastic wrap.good way to use up a lot of water colors I have left over