I bought four balls of reasonably boring variegated yarn during the summer. The challenge has been to come up with ideas to liven up the color contrasts. In this case, what works is the single row of turquoise near the top of the sock and again in the instep. The rows of burgundy and rust add very little contrast.
So the next pair in shades of blues and greys will want something that pops out – need to think about a bright green or a red.