Both, I went to Bashas, a local grocery store and asked them to give me 4 dz donuts. I wanted one doz frosted in green icing, and one doz of the jelly filled to be filled on the side and frosted white. I found the gummy iris at CVS in the Halloween Candy section. Then I bought red gel in a tube and various sized eyeballs from Michaels. These rounded out my dessert table with a super easy dessert that hardly took any time at all to decorate.
If I had a bag of Oreo cookies in the house I might have decorated the top of the donuts with the ghost peeps with crushed cookie. Thinking about it after the fact you could also wet down the chocolate icing with warm water and sprinkle on chocolate sprinkles. Id you did not want the rising out of the donut effect you could just lay the ghost peep on top the donut. The kids really liked the donuts with the ghost peeps I only had one left after the party.