I have this decorating tape and what she did was color each fondant piece and then laid them out on the table and with the rolling pin rolled them together until she got the size that she needed.
Hope this didn't confuse you.
There are two ways to marble fondant
1. White and any one colour
Take the fondant and roll it into a sausage. Apply colour color and fold over each end. Re-roll to a sausage. Fold the ends over and again roll into a sausage. Continue doing till the paste is evenly marbled, form into a ball. Do not knead.
2. White and shades of any one colour or two different colours. Divide the fondant and color as desired. Make a number of ropes in each color and lay them side by side in alternating color randomly. Roll into a sausage and fold in the ends. Do this once or twice more. Form into a ball and use. Do not knead.
All the best try it out.
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