Start with 2 sheets of card stock the same size. On one sheet, squeeze 2 different colors of acrylic paints direct from the tubes/bottles (I used blue and yellow) on to the card stock.
While paint is still wet, layer second sheet of card stock directly over top to create a "sandwich". Press down and swirl card around.
Remove top card stock to reveal the two sheets.
There are endless possibilities on how these turn out, depending on what colors you choose, how much paint, where you place the paint, and how much you swirl. A great technique for playing, while waiting for inspiration.