You can use birthday cake Oreos, any wafer cookies, sweet crackers (like Graham crackers), or other types of vanilla sandwich cookies to make the crust of this birthday cake lush cake.  2. Add additional garnish to the top of your cake such as chocolate shavings, coconut flakes or a sprinkling of crushed Golden Oreos. 3. For a low sugar birthday cake lush cake, consider using a low sugar or sugar free vanilla instant pudding.  4. Make mini birthday cake lush cakes by using these mini pie pans or ramekins.