Apparently I am addicted to the same rocks. Well, I like different ones, too, but since that majority of my collecting has been done by the Pacific Ocean, the Smith River, and now our Inland Sea, Lake Michigan, I mostly find rounded ones. My favorites are pure white round or egg shape, flat black ones I can stack, sparkly ones, and anything else that grabs my attention. I was looking through my California rocks and did a double take. California rocks on the right, Lake Michigan rocks on the left.
I thought it was interesting that I picked up almost identical rocks over 2,000 miles away.