Ooh! First post! This is not a sock bunny, but fun and bunny-related.
The pattern is by Jackie Erickson-Schweitzer, and is available here http://www.heartstringsfiberarts.com/bunny.shtm It's a super fun pattern- just knit a square, and from there it's all creative stuffing and folding. The best part is pulling a bit of stuffing out of the bunny butt with a crochet hook for the 'cotton tail'. Note that I knit this using the 'old' ears pattern.