Butterscotch: Substitute 6 Tbl brown sugar for sugar. Add 1 Tbl butter to cooked filling.
Chocolate: Add 2 squares melted unseeted chocolate to hot milk, beat well before adding eggs. Increase sugar to ½ Cup
Coconut: Add ½ Cup coconut to cooked filling
Banana: Substitute ½ tsp lemon juice for vanilla. Add 1 banana diced to cooled, cooked filling