I actually prefer the term CI, or computational intelligence over AI. There is a wide gamut of things using CI or AI to do or explore art, with art being a very flexible concept. I consider 'Inceptionism' a form of art [1]. I did some personal explorations using GA (Genetic Algorithms) to score some music to my liking by letting the system evolve short melodies, and then based on a -1, 0, 1 score I gave them, evolve more samples for me to listen to. I played with Mathematica quite a bit after Stephen Wolfram published 'A New Kind of Science', and tried creating CAs (cellular automata) that started on one of the sides as well as the top, and created my own rules for where they intersected on the diaganol with restarts. I am now into livecoding music and graphics at a beginner level, and I am already trying to incorporate feedback, or competitive coding by a neural network doing time series analysis on my output and playing off of me like a jazz musician would, but it is in the concept, and prototype stage now.
A conceptual idea I had in the 1990s involved writing a computer virus whose purpose was to replicate, and hide undetected in the system with no purpose to do harm, or do anything for that matter, but only to serve as a 'time-capsule' with a message to be released in the year 2000. I thought creating code that could evolve to seek new places to place itself on its own would be cool, and have a message popup on many terminals or out of a printer saying, "I am alive!". Needless to say I learned a lot about self-modifying code, but never created it. I think game AI is incredible, but it is a field I have only read about. I am sure there are a lot of things going on that you wouldn't guess from just playing the game. Unfortunately, I have never really been a gamer; it just never bit me.