I love the monster cookies, they are made with a grass tip. The big eyes are plastic rings, a fun surprise for the little kid eating the cookie.
When you think of Halloween of course you think of pumpkins. I did some with Jack-O-Lantern faces and left others plain.
Spiders are creepy so they go along with Halloween as well. I swirled the black around the cookie over the white, then pulled a knife through it to make the webbing. The spider is made with a grass tip.
There are limitless things you could make and fun to decorate.