First of all, here's the example animation from class! It's easy to create a living animation loop with only a handful of frames. Feel free to challenge yourself by drawing more frames or more complicated movement.

 

Bonus Animations!

Here are some animated GIFs for an upcoming film I am working on. I drew and animated all of them in Photoshop:

 

 

I hope these inspire you to create some awesome stuff. Happy animating!