Trying to be cute, I thought I'd make mine in the shape of puzzle pieces. You can see how it was fizzing out of and over the mold...a bit marshmallow-y.
In the end, I crumbled it all in a bowl and let it dry out. It was divided into cute cellophane bags and given to non-sugar eating friends (who wouldn't enjoy the marshmallows).
When I get my hands on bentonite, I'm going to try this recipe.