Begin by rimming the glasses. Mix the celery salt and oregano together in a small saucer or side plate. Moisten the rims of 4 cocktail glasses and dip and roll them into the spices to coat. Fill with ice.
Pour the vodka and Clamato juice into a large pitcher and add horseradish, hot sauce, Worcestershire, olive oil and oregano. Blend with an immersion blender and pour into prepared glasses. Alternatively blend in a food processor or stand blender or simply whisk or stir. A thorough blending not only mixes the works but emulsifies the oil giving the drink a luscious texture.
Playfully garnish the glasses with the remaining ingredients and your imagination! The more outlandish the better!