What one person considers beautiful, another considers ugly. I might love and be excited about a lesson plan I write, while another teacher may disagree my idea and want to teach the same topic differently. It is important to experiment with new and innovative ideas. If they are not as successful as hoped, the ideas may be modified for future use. Art does not have one specific form, and neither does teaching.
Teaching is creative, as is art.
In my opinion, it has to be. Students need to be engaged in what they are doing and creative lessons will help them do this. There is so much a teacher can do besides stand in front of the room with the students at their desks telling them what they need to know. From my experiences, students like to figure things out for themselves. As a teacher, I need to plan creative and thought-provoking ways of presenting material so that my students can come to their own conclusions about the idea or topic.