The moving animation on this one was actually kind of tough.
Basically wanted a snaking motion in which the tail follows the weight of the head. So I tried to imagine a rope being held at one end and being flung up and down in regular rhythms:
That was basically to figure out where the Creep's 'spine' would be at any given moment. From there I could draw the actual body in each frame.
A little fun fact, there...