But what has changing the colour of your passports got to do with views about Brexit?
EU passports can be any colour under the sun that a nation's government wishes them to be.

Maggie Thatcher's decision in 1988 to change the colour of the British passport to maroon was made before the EU had actually come into existence. No one made her do it. Maybe she liked the colour.

Regardless of what happens as regards membership of the EU, Britain has every right to reverse that colour change. I'd be in favour of there being a blue British passport, just as I'd be happy to see my Irish (and EU) passport go back to being green.