To create texture in your projects, try free-motion sewing.
To set up free motion sewing, cover (or lower) the feed dogs with the Darning Plate from the accessory compartment. Remove the presser foot and shank, then attach the Darning/Embroidery Foot. Select a straight stitch and begin making circular motions on the fabric until it is completely filled in. Do not worry if the stitches are not uniform. Cross the thread lines and just have fun filling in the space.
Remember that once the feed dogs are covered (or lowered) you control where the fabric goes and at what rate of speed. Try practicing on a scrap of fabric to get more comfortable!