Apply a line of dye along fabric edge. Use a large wet paintbrush to push dye upward on fabric. Continue dipping brush into water and brush along edge of dye, pulling colour upward to create a gradation of the original colour.
So J2 is such a girly girl (the opposite of me), this would be a fun craft together with her. I love crafts that are really useful. Don't like crafts that just sits there no matter how cute it looks since I get sick and bored of it if it collects dust.