can also use snapshot canvas option to take a screenshot of something, and then set that picture to a sprite image, via load sprite image from url. as i saw you were asking about an RPG, this would allow users to create their own armor etc, that is, if you can get a working editor.
i hear r0j0hound has a canvas plugin that allows you to draw.
saw mention of it being added into c3, though i havent followed up on it much.