The only way to get a mottled effect using 3 glasses Biscuit cake, without baking

The only way to get a mottled effect using 3 glasses Biscuit cake, without baking Ingredients: biscuits 200 g (7 oz) melted butter 150 g (5. 3 oz) IN THE FRIDGE 30 MIN for the cream: starch 150 g (5. 3 oz) sugar 150 g (5. 3 oz) milk 1. 5 l (51 fl oz) cheese cream 350 g oz) nutella 150 g (5. 3 oz) Jaffa biscuits 200 g (7 oz) IN THE FRIDGE 20 MIN