This seamless, circular one piece cowl can be made with any weight yarn and as much colours as you like. You can easily size the pattern up or down and experiment with shades (also nice to use up your leftovers).
It’s quite simple knitting as well, you only need some purl, knit and slip stitches and a little bit of stranding. The cowl (size L) on the photo is made with aran weight yarn and 4 different colours (170 gram total).
Happy knitting!