SpeedStep can be used to create and develop garment designs. It allows users to trace photographs, scanned images, or freehand sketches. Users can add design elements like collars, pockets, and waistbands. SpeedStep also enables creating color palettes, applying patterns and textures to designs, and draping designs onto photos to further develop ideas. The document discusses using existing images and developing design concepts, as well as generating images in ProPainter through techniques like color reduction, color swapping, and scanning in original artwork.