The public domain images include leaves, flags, symbols, maps and lines. These are all free for the taking. You can use them for whatever purpose you'd like, without any link back to this site. Take them! Use them! Get creative! :)
The custom original images, on the other hand, are available for use, but only if you provide a link back to this page. The link must be on each and every page where the graphics are used. These images include border sets, backgrounds, buttons, bars/lines and icons.
All that being said, enjoy the graphics. If you agree with me and think this country is amazing, put a flag or maple leaf on your site...be proud!