Its one of the decorative stitches on my Pfaff E3.0 and is on many others as well. Hope you have one! I know it can be stretched or widened. Good luck!

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Thanks! My machine doesn't have any such setting:(

You could try using a quilting stencil. Just trace the lines onto your cloth with a non-permanent pencil or use the stencil spray, then stitch on top of it. When you are done the pencil/spray washes out. You can find quilting stencils in the quilting notions section of Hancock Fabrics and I'm sure JoAnn's has a good selection too. Good luck.

Thanks everyone! I did get a walking foot on Amazon, but when I went to put it on found I needed an extender bar for my machine. So that doubled the price, but I got it on last night, and it did an OK job. I am happy with it for a first time. The wavy lines were not as easy as I had thought, and next time, I will go straight. I also did not cross over the lines.
All in All I was happy with my purchase! Thanks again for all your help.

If you are using the wavy one that is built into your machine you cannot use a walking foot. I have done many, and I do mean many quilts using the one built into my machine and never had a problem using a regular sewing foot.