I've seen those before, like a couple years ago. Are you sure they were created for this recent event? Maybe they just reused the images for the website?

I have so many thoughts for an American flag. So far the most American one I can think of that might taste good,
Blue: Blue corn chips
Stars: American cheese (yes it comes in white)
Stipes: I agree with you Alex, Bacon it could be both red and white.
not sure how all that would taste together but...
Another idea involves a blueberry cobler with strawberries and whipped cream. This was fun!

British budgetary cuts mean that we'll just reclaim the top-left corner of the Australian meat pie, but enhance the ketchup flag with a royal sausage-and-mash Onion Jack :)

Canadian flag.
red = maple syrup
white = poutine

Other Canadian foods to consider:
buttertarts
beaver tails
kraft dinner

Craig is correct. These same images were used to promote the Syndey International Food Festival a couple of years ago. In fact I recall it being featured on Neatorama.

I've been trying to come up with an idea for the American flag, but I think Kirsten nailed it with blueberry cobbler. With strawberries and whipped cream, you've got the right colors, and it's a food that represents "classic Americana". It's tough to come up with a blue food.

Beautiful ideas!