I was wondering, if it's perhaps relatively common between nations for passports to be red, but from some very quick image searching that doesn't really seem to be the case:
The U.S. bulletproof model was proposed for school children. Sadly, Republicans successfully fought against it, because it "Would give the kids an unfair advantage over the school shooters."
Never thought of it before but they could make sections of this new enormous passport edible .... pages 14 to 16 could be used as an emergency ration if you get caught in a war zone.
Iirc, you can only choose red, blue, black, and green. Maybe other colors are possible, but not preferred (I can see a white passport looking pretty rough after a couple years, if you’re a heavy traveler). No idea why they wouldn’t stick with red though.
You can see the text on the front of them for what they are for. Blue are regular passports for casual travel. Red are diplomatic passports for high ranking officials. Green are special passports for senators, MPs or government workers on official business. White temporary passports are usually issued abroad where a Canadian citizen has an urgent requirement to travel but doesn't have a passport for whatever reason.
I never said it had to be an app or a card in your phone’s wallet, although it’s not a bad idea. Passports have chips now. I just think it doesn’t need to be a booklet anymore.