Double crochet is a basic crochet stitch. It can be used to make a scarf, a placemat, a blanket, and even a beanie.
A double crochet can be used to create raised textures.
Just make the placement a bit different.
Look at this headband video!
It shows how to make front post double crochet stitches. It creates that raised texture on one side.
Bindu