Passports around the world come in the shades of four primary
colors, and each country has its own reason for choosing one of
them.

Passports come in 4 different colours (pic: money.cnn.com)
This is the most common colour. Passports with red covers are usually selected by post-communist countries. Citizens of Slovenia, China, Serbia, Russia, Latvia, Romania, Poland and Georgia have red passports. Most of the European Union nations feature passport covers of burgundy or varying shades of red, Brightside.me reveals.
Blue
This is the second most common colour for a passport. A blue cover
symbolizes the “new world”. 15 countries in the Caribbean have blue
passports. As for the South American nations, this color represents
the connection with Mercosur, a trade union. This includes Brazil,
Argentina and Paraguay.
Green
Most Muslim countries have green passports. There are a few
exceptions: Morocco, Saudi Arabia and Pakistan. Green is considered
the favorite color of Prophet Muhammad and a symbol of nature and
life.
Black
These are the rarest passports. They can be found in some African
countries such as Botswana, Zambia, Burundi, Gabon, Angola, Chad,
Congo, Malawi etc. New Zealand’s citizens have black passports as
well, because black is country’s national color.
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