These three animations have allowed us to explore different approaches to animation. The bouncing ball showed the pose to pose approach, plus many animation principles. Animating the Blender logo employed several tricks of Grease Pencil to reuse and control animations. The fight scene took us through a straight-ahead workflow, tackling each keyframe right after the next.
This is only the start of where Grease Pencil can take you. I've got three or four other files with exquisite corpse experiments that could be polished into the next sequence of the overall animation.