The crochet keyhole wave stitch has spaces on the tops and bottoms of the waves that are visually appealing.
These are easy-going waves. Once the pattern is established, you can easily do this stitch. I show in the tutorial doing the regular stitches or favouring the back loops for texture appearance.
Get started right away with the tutorial below. Make a wave blanket in any size.
The crochet ripples in the sand blanket remind me of this stitch. Not quite the same, but the keyholes trigger my memory.