Here's a behavior
which allows you to flip a Sprite on his side (it was sitting on my harddrive, nearly finished, I just needed to test it on Chrome...) !
To make it work, you need to have a Sprite with two frames, when the first frame is flipped, the second one appears behind it.
4 consecutives screenshots to show the effet (it's more pronounced in Firefox than Chrome, I need to check the perspective).
It's also working on iOS (I just tested it on an iPad 1st gen with iOS 5.1).
In the next release, you'll have the possibility to se the perspective, axis (left/right,up/down), and back color.
I also need to make it work in Opera...
The demo : http://dl.dropbox.com/u/1412774/C2FlipTest/index.html
The .capx : http://dl.dropbox.com/u/1412774/C2FlipTest/C2FlipTest.capx
The plugin : http://dl.dropbox.com/u/1412774/C2FlipTest/pode_flippy.0.1.zip
One cool thing is that I can leverage the method to add other CSS2/CSS3 effects to objects in C2. So in the next few weeks, you are going to see some new effects !