Waves and ripples are a soothing pattern. Just think of a calm day at the lake and ripples moving over the water after a Loon makes a splash. Many designs use rippled lines as a decorative motif, whether smoother, round peaks above, or more angular and made of interlocked chevrons as below. Either way, many patterns are available, using a large number of stitching techniques to match your preferences and your skills. A link to the free pattern is below photos.
Go to the pattern: