It really just depends on the company and the run. Game marbles often have patterns similar to the company's other marbles, just one color, and I have seen very nice patterns on some of them.
Last pic, 3rd from the left looks like it might be hand-gathered slag, like Roberto said. The second from the right looks more like a WV Swirl than a slag and so does the dark (black?) one. I would need more views to say much more.