In a large bowl, stir together cream cheese, pesto, Parmesan and shredded Italian cheese blend. Form into a ball the shape of a face. Cover with plastic wrap and refrigerate for 2 hours.
Remove from the refrigerator and add black olive slices for eyes (make a slight indentation with your baby finger so the eyes stick), then add a baby carrot nose and a slice of sun-dried tomato for the mouth or another black olive. Lay parsley over her head to create hair.
Toast a piece of bread and then cut it into a triangle to resemble a witch hat. Use a butter knife to make an indentation in the top of her head so you can press the hat into the cream cheese to serve. Decorate with additional spiders or bats. Serve with crackers. This can be served immediately or made a day in advance.