Mix together the icing sugar and cold water to make a thick white icing. If the consistency is too runny, just add more icing sugar. If the consistency is too thick, add a drop more water.

Spoon the icing onto the Oreos to make a skeleton face. Leave the icing to dry and set completely (this will take about 10 minutes).

Now use the black icing writing pen to draw skeleton faces on top of the icing.

Cut the straws down the middle to make two short straws. Use your fingertips to flatten one end of the straws and gently push it into the Oreo filling.