A while back (second semester of Animation, roughly a semester or two ago) our teacher had us do a flour sack animation. The guidelines were as follows.
-Must walk at least 3 steps
-Must do something interesting or have something of interest happen
-NO ADVANCED TECHNIQUES (no IK rigging)
-Must go through a hole at the end
Everything else was free range for us to play with. This was my result.
The more I look at the thing, the less I've been liking it though. I'm in the process of going back through this and adding/tweaking it.
By the way, this isn't the original render, he didn't want camera motions either. This is a rerender I did to show what the sack is doing better.