This is an animation that was done in 24 frames. Each frame was first thumbnailed out and then put into flash, synced up so they correlated with one another and then printed out, colored and then re-scanned back in to the computer for an overlay of the flash outline and final additions (like sound).
Each set of drawings are comprised of 24 frames, so when the whole thing is played together it actually only plays for 2 seconds. Each character moves in a loop.
My thought process on making something like this was to do something with the seven deadly sins and that idea somehow morphed into the seven deadly nuns. Starting with Sloth.