<p>You don’t have to send in the official test report until you graduate. There are different schools of thought about whether you should self report bad scores. My inclination is to say that you should report scores for courses that appear on your transcript, but that you are under no ethical or moral obligation to report scores for which you self-studied. I do think colleges are free to assume you got a one if you don’t tell them what you actually got. 
That said, I don’t think it would hurt you, you could always make a note that you took AP Art because of scheduling conflicts and it sounded interesting, though you have no particular talent for it. In our school, like many others, they won’t let you into AP art without years of prereqs. </p>
<p>Way back when, one of my good friends in high school did AP art with no prior experience in art. She had a great imagination and her themed portfolio was fantastic. They’ve changed the rules a bit since I did AP Art and I have the sense that the grading has gotten more stringent. If you search around a bit on line, some schools post their student’s portfolios along with the scores.</p>