I think art can be anything you do that you care about. I can't draw a picture to save my life, but I can work with wood(timber you fucking deviants) better than most, and I put a lot of heart into it, therefore that is my art. That being said though, art is very personal and subjective. Someone may spend months painting a picture that looks like crap to everybody else, but to them it is their art.
What I don't like is all these dickheads that sit around and say that painting means this or this writing is a metaphor for that, especially if the creator has been dead for hundreds of years. They don't fucking know, they just make shit up. The same piece of art can mean a lot of different things to different people.