If you're unfamiliar with entrelac I suggest you do a little bit of googling. Essentially it's a basketweave done on a diagonal. It's made of small squares/diamonds built on top of each other in tiers. Each tier is created in opposite directions which gives the basketweave look.
In traditional entrelac a base row is created using triangles to form a straight edge. As this is a sock we are starting from the toe and with some shaping we will turn some flat diamonds into a curve we can squeeze our tootsies in. From there we build along the foot and with some tricky bits we expand around the ankle and tighten to create a heel. From there it's move up the leg and finish however you choose. My finish is fairly basic but retains the zigzag effect of entrelac which I think is pretty cool so I'll show you how to do that.
I've attached a few pictures to get your creative juices flowing while I get started on sock number 2 so I can take photos and give you some step by step instructions.