This is actually a decision I made in nursing school, and it might have radically changed my life if I had gone in that direction. I took an elective class my last semester of nursing school where the professor and I went out and did art therapy in a shelter for homeless women and their children. In the past, his students had worked with the kids, but we both thought it would be interesting to work with the women instead. But the most interesting thing was I put up an "art wall" - a 10 foot piece of butcher paper that they could draw on between my visits. I wrote up instructions, starting off in a behaviorally neutral color. As the weeks progressed, I used different colors, and when I used red and black, the drawings became very "odd", violent, and dark. It was really interesting. My professor thought looking into this more in depth would make a great Master's thesis.
Well, I was one of those that though you should get some experience under your belt before getting your Masters. So I did, decided I didn't like psych, got married, had kids, got divorced. But every once and awhile I run across the drawings those women gave me to thank me for visiting them and I wonder "what if"...
So, 20 years later, I am going back to school
Pediatrics have been my bag for the last 10 years, but if I could find my passion for art therapy and psych again, who knows, maybe I will end up doing that for my thesis.