I've been meaning to start up a sketchbook here at ZBC for a while and now is a good time as any.
Here's a character I've been working on "AstroCrab". Pretty far along with this one still have some work to do to completely wrap the project up though. Some Retopo, UV and final details to put in. Working towards getting him into a real time viewer. Created all in ZBrush except for a base mesh for the mech arm and feet.