Fill the misting bottle halfway with the blender pen refill ink. Spray the liquid onto the card stock paper until the top of the paper just starts to look damp.
Draw the outline of a design with the markers just as you would if using a regular marker or pen onto the paper. You can also rub the marker tip onto the bottom of a stamp and then press the colored stamp onto the dampened paper.
Allow the paper to dry for about an hour. Spray the surface once more with the mister bottle until the paper is slightly damp on the surface.
Color in the design with the markers. Use lighter colors for a more realistic watercolor appearance. Apply enough color so that the design seeps through the paper to the other side. Allow the paper to dry completely.
Turn the paper over and use the back side as the front of the image. The resulting slightly blurred and lightened image will look very similar to a watercolor painted image.