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I am doing rainsticks with all my classes (that's why I asked that
question about rainsticks, I don't like doing "projects" in isolation,
that is, without some history or valid relationship to the theme).
Once a theme is established, the ideas seem to flow.
I have also done themes just in the art room (not school-wide). I just
finished one on Egypt. All the classes participated and then we had an
open house in the evening, the students were guides and answered
questions for the guests. It was very successful.
While I enjoy working on themes, I sometimes get a little bored and
imagine the students do too, so we take some time off and pursue other
interests for a week or two then return to the theme. This helps us
meet the curriculum too.