The kids have set up a stall on the street like they do every summer. Right now they are selling (or trying to sell) our home made and home grown rhubarb pies and goat cheese. Sales aren't usually very big but we do sell a bit. The kids do most of the work. The baking of the pies, picking of the rhubarb, milking the goats, making the cheese, selling ect... What we sell changes frequently, mostly it's food but sometimes you can by Christmas tree ornaments, candles, once we even sold Italian "dictionaries".
When we first started (when Sarah was 7) we decided that the money would go to seeds, homeschool resources, and "Green Team". It has been like this ever since.