This first flag is my favorite by far. Whenever the SG's come together, if the name allows, I think this would be a really cool flag to use. We can replace the crest in the center with our SG crest. And either fully remove the NYC seal in the top left, or replace it with something else. Though I kinda like it there.
This next flag uses the colors on Amsterdam. It looks cool, though it's definitely got a Third Reich feel to it.
If there is anyone out there with even miniscule photoshop or MSPaint talent, think you can alter the top flag a little? Like adding a white outline to the blue "cross" and filling in the white background with the light blue/ManC Blue.