I have heard stuff similar to this called fret work, gingerbread trim, and bargeboard. Not knowing if there are specifics to each, I will leave it to you the reader to decide what to call it. I call it pretty. I never see any of this type of work without thinking what a chore it must be to paint it. And this even more so because it is painted different colors. I almost think I would like it better if it were all one color. And that because the background is basically green. I suppose if if it was all white behind it, I would like it better this way. Either way it is pretty, and was a lot of talent and work to do it.