These socks are for my son who picked out "rainbow yarn" this summer. Thanks to Ravelry, I discovered that the colorway knits up more red than I expected. To keep my blue-loving child happy I added in blue heel, toe and cuff.
The rainbow yarn is Brown Sheep Wildfoote in Rock and Roll and the blue is from a 50g ball of Trekking I bought a few years ago. Amazingly, the blues matched really well.