This is the result of a test I did at work of a new animation tool called Spine. It's 2D animation with a skeletal rig. It's the perfect tool for someone who has done a bunch of 3D animation to do come to 2D cut outs style animation. It's pretty simple and intuitive and our programmers seem confident that they won't have much trouble getting it into a game (it's what the tool was made to do, after all). http://esotericsoftware.com/
Sorry, I don't see any way to make it loop automatically through blogger. I suppose you can load it onto your hard drive and loop it with your player.