I'm a 3d modeller for a car company and I do game development as a hobby. I am currently using A6 3d Gamestudio, doing all programming, artwork and design. I'm also the lead artist for an independant Game Development team.
Here is the Rocket AI sprite sheet. My game uses an incredibly simple, incredibly short animation frames for all characters, each only taking 7 frames of animation. I literally just flip the direction, that even includes flipping the sprite on its back to represent looking up! Its very crude, but very easy and actually funny!