That´s interesting, they are considered good luck here too, but not at weddings, just generally when you see one in the street. You are supposed to touch him and make a wish, I think. We often have little plastic chimney sweeps in plant pots with lucky clover for the New Year as a gift, both symbols of luck. And as you call it "lucky clover" as well shows me you consider four-leaved clover lucky too. How interesting, so many similarities in such things. Other symbols of luck, especially at New Year, are pigs and fly agarics. And when we still had Deutsche Mark before the Euro, the smallest coin was considered good luck too if you found one penny in the street.