1. Tint one-quarter of the dough dark green with the food coloring, kneading food coloring into the dough*. Divide the remaining dough into 5 portions. Tint each portion a lighter green than the one before. Wrap each portion in plastic wrap and chill 45 to 60 minutes or until easy to handle.
2. Preheat oven to 375 degrees F. Line baking sheets with parchment paper. On a lightly floured surface, roll the large, darkest green portion of dough to 1/4-inch thickness. Using a 4 1/2-inch star-shaped cookie cutter, cut 8 cookies from the dough, re-rolling scraps as needed. Place on the prepared baking sheets. Bake about 8 minutes or until edges are just firm but not yet brown. Let cool on wire racks. Roll the next 2 darkest portions of dough as above, using a 3 1/2-inch star-shaped cutter to cut 8 of each color. Bake 6 to 8 minutes or until edges are firm but not yet brown. Cool on wire racks. Roll, bake, and cool the next 2 darkest portions of dough as above, using a 3-inch star-shaped cutter to cut 8 of each color. Roll, bake, and cool the remaining portion of dough, using a 2-inch star-shaped cutter to cut 8 cutouts. (You will have extra cutouts of some sizes).
3. Once cookies are cool, stack the stars, starting with the large dark stars and ending with the lightest color small star. Insert a wooden pick into the center of each stack. Top each toothpick with gold, star-shaped stickers (available at office supply stores).