1In large bowl, beat sugar, butter, vanilla and eggs with electric mixer on medium speed, or mix with spoon. Stir in flour, salt and baking soda. Divide dough in half. Stir 1/2 teaspoon food color into 1 half, or stir 1/2 teaspoon of different food colors into each half. Cover both halves and refrigerate 1 hour.
2On very lightly floured surface, shape each halfof dough into 2 strips, each about 9x2 1/2 inches. Layer strips, alternating colors; press together. Wrap and refrigerate about 2 hours or until firm.
3Heat oven to 400°F. Cut dough into 1/8-inch slices. On ungreased cookie sheet, place slices about 1 inch apart. Bake 8 to 10 minutes or just until edges are golden brown. Immediately remove from cookie sheet to coolingrack; cool.