In a large mixing bowl, combine softened cream cheese, cheddar cheese, and blue cheese.
Add the diced green bell pepper, chives, walnuts, Worcestershire sauce, garlic powder, and smoked paprika to the bowl.
Season the mixture with salt and pepper, adjusting according to taste.
Shape the mixture into a ball or log shape and wrap it tightly in plastic wrap.
Refrigerate for at least 2 hours or overnight, allowing the flavors to develop.
Before serving, roll the cheese ball in additional chopped walnuts or herbs, if desired.
Serve with an assortment of crackers, fresh vegetables, or toasts.