A friend of mine shared a book with me called WE CELEBRATE THE HARVEST by
Bobbie Kalman (ISBN: 0865050546 -- hope that's right). There's good
background info. on harvest celebrations around the world including Tet,
Chu-sok, and Sukkoth, that can be the starting point for art projects, though
some art ideas are included.
I've found that two staples that seem to be quite common in different
festivals is rice and corn. If you have any good projects related to these
things, please let me know.
Thanks a lot for your responses!