Summary Two sizes, Top-down, 5 double-pointed needles, fair isle colorwork.

From Knit Socks! page 112:

"Combine your favorite colors and a special message to create socks that reflect your personality and make you smile. This new twist on a traditional style is a great way to learn or practice two-color stranded Fair Isle techniques. Don't show these socks to your friends unless you want to take orders!"

Fair Isle chart included for each letter of the alphabet and colorwork patterns.