These are plain sugar cookies that I used to make two different shapes. For the tombstones, I used black gel food coloring to dye the dough grey in an attempt to achieve a stone-colored cookie. I didn't know how much to use; I had the dough the color I wanted the cookie, but the cookies came out much lighter. Next time I'd use more coloring, but I was still happy with the results. (Too bad I didn't have a fake grass mat to set them up on, like a real graveyard...)
For the Jack o'lanterns, I used uncolored dough. For the large ones, I used a cookie press. For the small ones, I made various faces with tiny cutters.
Then I frosted them with plain icing, using the "flood" technique. It's the first time I've tried that, and it will take some practice to get the consistency right.
The cookie stamp left a raised impression, which was hard to ice cleanly. It's better if the impression is indented so that the icing just pools in the hollow.