This wonderful moss stitch ripple makes a beautiful scarf. (See blog links for details in English and Dutch.)

Use a hook several sizes larger than yarn recommends.

This is not a fixed pattern, but rather a ripple stitch and examples.

Mriek made a scarf using Unicat yarn, and crochet hook 5.5mm (I). She started with a chain 120 stitches (5 repeats x 24 st).