Excellent! I'm sure this one will come in very handy. I think this behavior is especially great because it provides a good point from which to build other graphic behaviors. Looking at the runtime.js, it's easy to see how further manipulations can be done.
Thanks for providing this one.
Also, I did a quick edit of the Fade behavior's icon and am posting it here in case you might want a different icon for it.PluginIcon.ico