Hey @xxbabydollxx!
I had the exact same reaction 
I was not sure what the purpose or intent of the pebble was.
I laughed so hard because was not expecting it.
That’s when someone gave me the idea to repurpose it into a necklace.
She said that when you don’t know the purpose of something, it just means it’s a blank canvas and that gives you the opportunity to create the purpose.
She said that because it brought on laughter; if I wear it around my neck it will serve as a personal reminder of just that. Laughter. Spontaneous laughter to be precise. And I found that to be more than enough of a reason for having it
Regarding the story behind the pebbles, I actually just received a mailer from Sofi today with a roundup of some important articles; one of which was in part an explanation of the origin of these pebbles. I will link it below.
And I have to say, knowing that someone picked this up to give to me is special in a very subtle way. An effort was made and was received with appreciation and joy as a result. Maybe this was exactly the purpose as the exact reason is yet unknown to me.