Lightly spray cookie sheet with cooking spray. In large bowl, break up cookie dough. Stir or knead in flour until well blended. Reshape into log. If too soft to cut into slices, refrigerate up to 30 minutes.
Heat oven to 350°F. Cut dough into 30 (1/4 inch) slices. With 24 of the slices, cut 2 narrow strips from sides of each slice, leaving a triangle for body (see illustration). Place 2 strips on each side of top point of triangle, curved edges down, for wings. Cut 6 slices into quarters. Roll 1 of the quarter slices into ball; flatten slightly and place at top of triangle for head. On ungreased cookie sheets, place angels 2 inches apart.
Bake 7 to 11 minutes or until light golden brown. Cool 1 minute; carefully remove from cookie sheets to cooling racks. Cool completely, about 20 minutes. Spread frosting on cooled cookies. Decorate as desired with remaining ingredients.