I've seen pizzas with alfredo/"white sauce" as a base (not sure if by white sauce they mean bechamel or something else), usually with something like chicken or broccoli, or buffalo sauce on a buffalo chicken pizza, or even something like pesto with mozzarella and tomato. Tomato sauce is the classic option but there's definitely room for some creative options.
As opposed to Trump, who's so trustworthy and predictable.