Baking your lawn
The Sustain website has details of a project called 'Bake Your Lawn' which encourages people to plant a square metre of wheat and take it through all the stages from growing to bread baking (and eating!).Parents could get really excited about doing this with the kids but it could be best suited for communal efforts - buying seed, harvesting days, milling etc. See: http://www.sustainweb.org/realbread/bake_your_lawn/
There is also information about community supported baking, taking the community supported agriculture idea and applying it to real bread bakeries. If anyone decides t take part, please keep MWPN informed of progress.