Heat oven to 400°F. Place English muffins, cut sides up, on ungreased cookie sheet. Spread pizza sauce over muffins; sprinkle with oregano. Top evenly with pepperoni and cheese.
Arrange 2 olive slices on each muffin half to look like eyes. Cut 6 bell pepper strips in half crosswise; place on muffin halves to look like nose. Add remaining bell pepper strips for mouths.
Bake 10 to 15 minutes or until lightly browned and cheese is melted.