The exibit is currently at our museum here in reno. I don't think that there are patterns available, but there is a book on them available to purchase. Or maybe your library has it for check out? Here is a link to see the book and to get the ubc code.
http://www.google.com/products/catalog?hl=en&q=Gee's+Bend+quilts&um=1&ie=UTF-8&cid=810870650842321873&ei=TLrAS4nXHZmyMb3ZuMoK&sa=X&oi=product_catalog_result&ct=result&resnum=4&ved=0CBYQ8wIwAw#ps-sellers