Unsurprisingly, I don't like really leaving things as they are, which is both good and bad: good because it means I'm constantly working at improving things and making them better, but not as good in that I keep seeing faults. That said, though, one of the recent things I redesigned are some passport stamps for some of my concountries.
I've found, in general, good passport stamps are
1.) Clear and unambiguous
If they look distinctive too, that's a big plus.
Anyways, here are the designs of the new Pearl Islands stamps:
And why not also an image of them in "use", too: