The phrase "yarn colors" refers to the different shades and tones that yarn (a type of thread) can come in. It means the variety of colors available to choose when working with yarn for knitting or crocheting. Full definition
This unique infinity scarf is created using three different yarn colors together, forming a lovely alternating pattern reminiscent of the beautiful cherry blossoms that bloom in the spring. (12thblog.com)
This infinity scarf is made using four neon yarn colors, and has a pretty design with descending square holes. (12thblog.com)
Choose a plain yarn color if you're looking for something more subtle. (12thblog.com)