They usually sign them on one of the poles, usually just initials. Some, like Steve Maslach, don`t sign their marbles. In your top picture the latticino swirl could be either Jody Fine or Steve Maslach, but leaning to Fine. The black & white one next to it has some resemblance to a Doug Ferguson one I have, but i don`t know for sure. Mine is called "Zebra Bubbles," and obviously has bubbles, placed at regular intervals. At some point our specialist in contemporary marbles, Alan, will stop by. He`ll know - and if he doesn`t, then nobody will!