Here's a behavior to apply image effects to a Sprite.
For the moment you can apply Sepia, Grayscale, a simple Blur, and Color correction (you need to test that last one yourself, to know what numbers to use to apply a color change. The 3 R,G,B parameters specify the amount by which each original pixel is going to be multiplied. So '1' means no change, less than 1 mean less of that color channel, and more than 1 mean more of that channel). It's way slower than the Recolor Behavior to recolorize Sprites, but it uses way less memory (it's a tradoff you need to take into account when designing your game).
You can reset the filters if you save the original image first (there's a "save original" function). Since it's using some memory to store the original image, I didn't made the behavior use the save by deffault. So if you reset without having done a save before, you get blank images !
You can also get back the filtered image and the original image (if saved previously) as base64 strings.
The demo : http://dl.dropbox.com/u/1412774/C2ImageEffectsDemo/index.html
The plugin : http://dl.dropbox.com/u/1412774/C2ImageEffectsDemo/pode_imageEffects.1.0.zip
The .capx : http://dl.dropbox.com/u/1412774/C2ImageEffectsDemo/C2ImageEffectsDemo.capx