One of the designs we came up with using white butter icing as background, sprinkled with Oreos and decorated with half an Oreo in the centre, on a vanilla L size cupcake.
Another variation of the design. This time we piped the butter icing until it formed a cone shape. We sprinkled Oreos on the side of the cupcakes and decorated with two halves of an Oreo on each side of the cupcakes.