Make a snowman out of marshmallows
Marshmallows, large jelly sweets eg Fruit Pastilles, strawberry laces or similar, Smarties, small skewers, writing icing
Stick two marshmallows on the skewer and top with a jelly sweet for a hat. Wrap a length of strawberry lace around the middle as a scarf. Draw on a face using writing icing and stick on Smarties as buttons.
I got the jelly sweets and laces from Poundland - one pack of each was enough for a group of 26.