Celery flower art is another great Mother's Day idea or just a simple art project for the classroom. I think the idea of using food to create art would be an interesting project to bring to the classroom and have students work with and experiment with.
Mothers Day or Teacher's Appreciation handprint flower card. At Montessori they are with their teachers for three years. I'd like to try to remember to do a handprint each year, then give this as a gift at the end of the third year.