This is something I did recently for a client including the birds which are 2d animated. Brings back good memories. I might try my hand on a small 2d animated short when I can make out time.
I will have to do some character design and draw them over a lot of times so I can draw them for every frame staying on model.That's kind of time consuming though but it's the same as time spent modelling, texturing and rigging a character in 3d..I think.