The coolest German dessert has to be spaghetti ice cream. The first time I saw it, I really thought it was spaghetti. But it's just ice cream put through an instrument that makes the ice cream look like spaghetti. And then it's topped with strawberry topping and white chocolate. Kids love it too, it's great for their imagination.
I also like German chocolate desserts. Of all possible dessert ingredients, chocolate or cocoa is probably most commonly used in German cuisine.