This must be the easiest scarf in the world to make but the effect is quite dramatic.
If you can make a chain and double crochet (UK terminology), you can make this. You don’t even need to count the stitches.
Make it any yarn. I think lightweight thick yarns work best. You need a little more patience if you use thinner yarns. In my projects you can see Tail-odds-and-ender which is a version made entirely from oddments of yarn.
The pattern contains suggestions for several possible variations.