Here's one my kids have made in school at Halloween parties:
Halloween Spider Cookies
red licorice ropes
mini M&Ms or chocolate chips
Split the cookies and put three lengths of red rope licorice across the frosting, letting about 2 inches hang out both sides for legs. Add a little canned frosting and put the cookies back together. Put two small dollops of frosting on edge of cookie and add two M&Ms or chips for eyes.
**In case you aren't familiar with Oreo cookies, here's what they look like: