In my story, the Bad guys want everything to be white, so they use white banners. The good guys know not everything can be white and they use blue banners to mark the time the bad guys tried to change to color of the oceans and failed. But I feel that's not enough for my story. I want to use a drawable, abstract symbol to further identify each faction. Something you could put on a flag and identify it. After all, the plain white flag is one of surrender, and my Bad guys don't want that. I was thinking for the bad guys some form of a weapon cross. It could be two different weapons crossed (Like the communist hammer and sickle), or the same weapons crossed (like maybe two blades). but If this symbol is going to appear absolutely everywhere alongside the white banners, it has to be relatively simple to duplicate. The Duplication problem also exists for the good guys. This symbol of Peace and unity must be easy for anyone to draw it out. For these guys, I have no clue what I'm going to use. Can someone help me decide?