This class approached this idea with a "not so much" and a "not today" so I tried something different to draw the eye back to line and shape. I asked for egg shells (and we got them!) and the children glued these crunched shells onto maps, smooshing them and layering them. Later when the glue dried, the children painted the layered shells with watercolor. We arrived in the same place, shape and line, with an added bonus: texture!