Experiment with the marks that can be made with different drawing instruments on a range of surfaces.
Ideas (loads more: http://ppds.pdst.ie/components/com_mtree/attachment.php?link_id=1104&cf_id=24)
Discover and draw line and shape as seen in natural and manufactured objects and discover that lines can make shapes. Get children to look at everyday items in nature and in the classroom really closely to find lines in them and how they create shapes. Let children decide which drawing materials are best to draw them.
Exactly what it says on the tin!