How to Make It
Wash the plastic skull. If it's not marked as food safe, wrap it in plastic wrap or foil, making sure to leave the teeth exposed.
Mix the food coloring of your choice into cream cheese, and when your desired hue is achieved, spread it over the skull thickly enough that you are confident that the meat will adhere to it.
Layer the meat over the cream cheese, overlapping as needed until the surface is covered. Depending on the texture you'd like to achieve, press it down smoothly or let the edges hang roughly.
Slice the egg in half horizontally, and depending on the size of the skull's eye sockets, fit either the halves with whites, or just the yolks into the sockets, and secure olive or cocktail onion "pupils" in place with a toothpick. If the spirit so moves you, you can dye the yolks with drops of food coloring for additional spookiness.
Place the meat head on a tray or board and surround it whatever brunch foods you desire and allow guests to serve themselves buffet-style.