I received a walking foot as a holiday gift and have been playing with it for recent quilts. I have a guide on mine, so I can make parallel lines up to 3" apart and only need to mark the first line, which is a nice feature. I've done parallel lines of various width spacings, lines radiating out from a central star, orange peel with gentle curves, lines at 60 degree angles and now I'm working on a "plaid" by making a crosshatch with 3 colors of thread/widths of spacing.
I plan to do some free motion in the future, but for now I'm happy to play with the possibilities of the walking foot.