Heat oven to 350°F. In large bowl, break up cookie dough.
Shape half of dough into 1-inch balls. With floured fingers, roll each ball into 10-inch rope, about 1/4 inch wide. Break off small piece from each rope for tree trunk. Carefully place ropes on ungreased cookie sheet.
With each rope, starting at top, twist rope back and forth into tree shape, gradually making larger at bottom (rows of dough should touch). If rope breaks, press dough together. Place small piece at bottom of each tree for trunk. Repeat with remaining half of dough.
Bake 9 to 11 minutes or until edges are light golden brown. Cool 1 minute; remove from cookie sheet to cooling rack. Cool completely, about 15 minutes.
Drizzle each cookie with melted chocolate chips; place baking bits on top of drizzled chocolate to look like ornaments or lights.