I made a simple buttercream icing and tinted it green.
I 'glued' an ice cream cone to a plain biscuit using the buttercream, and then covered the cone in icing.
I provided the kids with a small bowl each filled with a selection of sprinkles and small pebbles and let them go for it.
The boys were quite focused on their decorating.
The Girl not so much.
Then the eating and sugar high began. Good fun.