These colors show a lot of contrast. I am pleased with this project. It is made with slip stitches, a multiple of 4 sts and 8 rounds. I can make it again with each of the four repeats in a different color.
This is the project page of the newer hat. I knitted this blue and yellow hat as Mosaic knitting, with slipped stitches. Geometry, made with slipped stitches I decided that for stitch multiples of 4 or fewer, stranded works better for me.