1. Make egg salad: In a medium saucepan, cover eggs with water. Bring to a boil; cook, uncovered, 2 minutes. Cover pan, and remove from heat; let stand 10 minutes. Hold eggs under cold running water to stop the cooking. Peel eggs.

2. Slice 2 eggs with a knife or an egg slicer. Set aside eight of the slices for eyes, and place remaining pieces in a bowl. Add unsliced eggs to bowl, and mash with a fork. Add mayonnaise, mustard, salt, and pepper; stir to combine.

3. Spread a thin layer of mayonnaise over each slice of bread. Cover bread with egg salad, or layer on sliced ham. Make faces using the egg-yolk slices, egg salad, and the remaining toppings, as desired. Serve immediately.