In a large mixing bowl, combine the softened cream cheese, cheddar cheese, and blue cheese (if using).
Add the diced green onions, crumbled bacon, Worcestershire sauce, and garlic powder to the bowl, and mix until fully combined.
Shape the mixture into a football or ball shape, using your hands for a smooth exterior.
Roll the cheeseball in the chopped nuts to coat the outside evenly.
Wrap the cheeseball tightly in plastic wrap and refrigerate for at least 2 hours, or overnight for best flavor.
Transfer the chilled cheeseball to a serving platter and garnish with smoked paprika if desired.
Serve with an array of dippers like crackers, pretzels, and fresh vegetables.