Basically what you got to do is get different colors of fondant that you want and then roll them out into little logs and then twist them all together -- and keep twisting it with your hand. Then just knead it a little bit. But you can’t over-knead it. Just knead it six or seven times.
After that cut it in half down the middle and flatten it out and then roll it into a tie-dye pattern or marble or whatever you want to do.