The phrase "art in hog heaven" refers to someone who is extremely pleased or content with a particular situation or circumstance. Some synonyms for this expression include "in seventh heaven," "over the moon," "in high spirits," and "on cloud nine." Another term that could be used to describe a person who is enjoying a great deal of artistic pleasure is "art aficionado" or "art enthusiast." These words suggest a deep appreciation and love for art, and convey a sense of enthusiasm and passion for the subject. Whatever word or phrase you use, the sentiment remains the same - happiness and joy in abundance.