Let's comment on the visual design of passports. These are all basically the same, except two that stand out: Switzerland, and The Vatican. The latter is very typically Swiss, with an attractive, simple, and modern design. The former is sinister and mysterious, but also quite distinctive.
Honorable mention to Brazil and Bosnia for having passports without a coat of arms type of thing on the front.
Honorable mention to Brazil and Bosnia for having passports without a coat of arms type of thing on the front.