1. Heat oven to 350 degrees F. In a large bowl, beat together butter, sugar, egg and salt until fluffy, 3 minutes. On low speed, beat in flour until smooth. Tint dough pale green with food coloring.
2. Spoon dough into a cookie press fitted with a standard wreath disc, following manufacturer's directions. Press out wreaths onto large baking sheets, spacing cookies about 3/4 inch apart. Before baking, press in candy "berries" or confetti.
3. Bake cookies at 350 degrees F for 8 to 10 minutes or until slightly puffed and set. Transfer cookies directly to wire racks to cool.