Use the 'customise' tool to make the IWB pen white to appear as chalk. You can clone the page to make enough for eah pupil. I used this in my class of children with severe learning difficulties.
I used this linked to the RSPB birdwatch. Following work on making charts, pupils then used the bar charts to put the correct number of birds onto the Smartboard 'park&'. My complex needs group loved showing they could use what was represented on a chart.