Bicycle Socks for Road Rides
I strongly recommend socks that can breathe easily and that absorb and wick away sweat.  That means probably not cotton athletic socks you'd get in bulk at a warehouse store.

Personal preference determines the coloration and logos, and if you're worried about style, get socks that match your kit and your shoes.

Also if your alma mater has a cycling team, contact them and see if you can buy team socks.  You'll be able to show school pride wherever you're riding, and they'll be quality.