Any sock pattern with thick wool. Like this one http://home.earthlink.net/~bruxknits...cSockChart.pdf
or if toe-up, increase until toe is wide enough, knit foot until it is long enough, do your preferred heel, knit the ankle/leg until it is long enough.
I like 2x2 ribbing for my pop whose feet get REALLY cold, other socks are too baggy at ankle, tight at calf, too short, not warm enough, do socks on pure merino, about 4.5 mm needles and he raves about them. Try searching for sockulators too.