The gradient color triangle shawl crocheting technique involves creating a triangle-shaped shawl with a gradient color pattern. This is achieved by alternating colors as you crochet, starting with one color and gradually transitioning to another. Techniques include changing colors in the middle of a row or round, and may involve special stitch patterns to enhance the gradient effect. This method is popular in crocheting as it allows for creative expression and can be used with various yarns and colors.