Diane Gaudynski, Quilt Savvy: Gaudynski's Machine Quilting Guidebook
Harriet Hargraves: Heirloom Machine Quilting
Ricky Tims, Grand Finale: Fine Machine Quilting (DVD)
Finally, its good to keep in mind, quilting shows up best on fabrics that are white or very light, solid fabrics rather than darker fabrics or fabrics with busy prints, (unless you want to quilt with contrasting thread, ie. light color thread on dark fabric and vice versa which is very unforgiving if you have unintended wiggles and wobbles).
The more you become confident and have fun with your machine quilting, the more you'll want to design and plan for quilts that offer alot of plain background fabric to quilt in. Also, for the backing, in the beginning you might want to use a busy print which will camoflouge wobbles, but as you get better, a white backing will show off your quilting, and will give you the look of a whole cloth quilt from the back where nothing but your quilting design will show.
The very best way to become skillful at choosing a quilting design is to go to as many quilt shows as you can to study what other quilters have done, where you can get up close and really see what rarely shows up in a photo, and then keep a book of ideas with you for the future. Its also really helpful when planning the quilting stage of your quilt if you create a diagram of your quilt, then make photocopies and rehearse several different ideas. Lastly, Sherry Rogers Harrison recommends transferring a quilting design onto thin upholstery vinyl magic marker, then overlay on top of your quilt as a way to rehearse various designs as well.
When you're ready to transfer your quilting design to the top of your quilt, here are a few suggestions: