started by add several drops of dye ink refill (one colour) to a plastic container with a lid. Add several marbles to the container and close the lid. Shake the box from side to side until the marbles are inked. The ink drops will be replaced by ink tracks in the container.
Stick the Cardstock to the inside of the lid of the container, and then close the lid. Flip the box upside down and shake the container from side to side so that the marbles are rolling all over the Cardstock. Continue until you like the look of the pattern on the Cardstock.