[JacobAldridge]

There are (roughly) 192 countries in the world.

It's a bit of an effort, but you could find an interesting fact[1] about each one, overlay on a creative commons photos from that country (or the national flag; or a map), and share the rest of the world with daily commuters. You'll even have a few days left at the end - maybe add a similar concept for each Japanese Prefecture.

[1] Or some statistics. Or even some simple phrases ("Good morning"; "have a nice day") in the local language.