Someone made a .cur .ico and .ani plugin, and .ani is an animated cursor, so i dont think this is the first animation plugin, but i agree, i want to see it for .gifs
To get this:
1. Adjustments > Black and White
2. Effects > Ed-Fects > Color tint (plugin, curves may alsowork)
3. Choose a cyan(light blue) color.
4. Ctrl+Shift+i to invert colors.
I'm not sure if that's what your looking for or not. But you can play around with it.