I could see making these on the cone-shaped forms around the winter holidays with green and red, Christmas-y Peeps. (They make those, right? They must.) You get the picture. In truth, there’s probably no limit to the marshmallow sculpture you can create.
http://www.thehungrymouse.com/2011/04/11/peep-topiary-plus-other-easter-table-top-decorating-ideas/ If you go to this website, you will see complete step-by-step directions.