Well I have never read anything about this pearl-like little things, they seen like a cool object to own and put a bunch of them someplace in the house like decoration.
And this "may be able to reveal secrets about climate changes in the past" would be of course another good use for them :).
And these are not the only examples of spheres you can find in out there. There are formations like the Moeraki Boulders that get even bigger...