I have some image buttons inside a Win8 Metro live tile (in a grid), and Metro makes it easy to animate the whole tile, but not items inside of it. What's the easiest way to do a "flip" animation on individual image-buttons (or at least images) periodically? Should I use createPeekAnimation? I'm open to using either C# or HTML5.
This is not supported. There are only tile templates that you can use. You can't do custom animations inside of a tile.