Our tombstone cookies make fun Halloween treats. Easy to make (I love easy), add just enough black food coloring to make gray, almost marbled cookies and then stamp your favorite treat-or-treaters' names on them. Or if you're me, stamp the names of some of your favorite ghosts from Beetlejuice.
Make your sugar cookies according to the recipe directions. Add a drop or two of black gel paste coloring to achieve the gray color (don't mix fully if you'd like to have marble like stripes in the cookies).
Once your sugar cookies have been cut out and in the freezer for a few minutes (if you use the recipe I used), carefully stamp the cookies. Press the stamps gently into the cookies. Bake per the recipe directions and enjoy.