Product idea: starch based expanding foam in a can. Think the same material as edible foam packing peanuts, but packaged like the Great Foam cans you see at Home Depot. Could be used instead of styrofoam for packaging, lost foam casting, edible sculptures, pre-cast concrete formwork, etc...
Here's a video of Green Cell Foam packaging material being dissolved in water:
Here's a video of Green Cell Foam packaging material being dissolved in water:

