These tonal collages are one of my favourite projects but also a little tedious as they take a long time to complete. I usually do this project after studying how to draw tonal shapes as the children have a better understanding of shade and tone. The first draw out the shape or shapes onto paper/card - I would do this no bigger than A5. I then have bags full of shredded tone. I print out 7/8 different sheets of A4 tones - from light to dark and different marks. Put the A4 sheets of tone through a shredder so they are in strips and place them in separate numbered bags. Get the children to number their drawings - picking out the lightest areas, the mid tones and the darkest areas. They they select the strips of tone and use a pritt stick to trim and stick down. The overall results look great when viewed from a distance.