I reviewed a course from iTunes U for Educator in the Inspiring Lessons category called iPad as Expressive Sound Canvas. It is a distinguished Educator course for Secondary Music. This collection is solely courses for a classroom.
This course is about creating connections between the visual arts and music. It gives topics to discuss and even assignments for the students to do. This course gives a basic outline into what you can focus on for each piece of the unit. It has three main parts to the unit, introducing the topic, building understanding and applying learning. Each section has a main ideas and possible assignments for the students to complete. Using this from a teacher perspective, this is just an outline. There are materials and things to use but you would be responsible for the teaching and day-to-day lesson planning. I really like the idea of this lesson. It is focused on helping students become more creative with jazz improvisation. It uses abstract expressionism art and more specifically a Jackson Pollock painting.
Overall, I think this is a fun unit to cover but be aware that this does not do all the work for you. You would still have to be responsible for the day to day planning and preparation. I plan to take a look at more of these courses and see what they have to offer.