Just found this interesting book online, listing hundreds of items (and far too many flags to list here) that were being displayed in 1864 in New York. This is worth looking through to see what you can find. Probably at lest 200-300 flags listed within.

http://books.google.com/books?id=FoYvAAAAYAAJ&printsec=frontcover&source=gbs_navlinks_s#v=onepage&q=&f=false