This pattern is worked in mosaic stitch, which works one color per row and design is created with slipped stitches. If you are unfamiliar with mosaic stitch, know that is does not stretch, and be prepared to possibly go up a size from what you would normally knit or potentially change needle size.
This pattern has a chart for each foot and options to knit repeating sunglasses up the leg or even just the simple sunburst pattern without the glasses. Create 2 different socks if wanted, or use as a stashbuster and have many different colors of glasses. Pattern continues on the bottom of the foot. Instructions included are for a heel flap, socks are written for toe up.