Finger stylus

I've been watching my kids using their DS consoles. One of the main things that I notice is the styluses constantly being left lying around, getting lost, chewed or otherwise broken.
It is certainly much easier to use a finger; with the added benefit that, in general, people are more accurate in using their built-in equipment rather than external tools. The trouble is, of course, that fingers are usually much too big for the resolution required by modern touch devices.
Essentially a stylus is a miniature finger, except that they tend to be wielded in a manner more like a pencil. The implement lies along the finger and extends past the tip to provide a finer contact point than possible with a finger. This has restrictions for the necessary length and thickness of the tool to make it possible to hold comfortably. For instance, nearly all styluses I have seen are too short and thin to be easily handled - a restriction applied by the form factor of the device being used and how easily the tool can be stored.
The thought occurs that the more natural movement would be using the finger itself. The issue then becomes the wide area of a finger tip. Filing a long finger-nail into a point would be one solution but is something that would inconvenient when not in use.
An artificial fingernail then, that can be slipped on and off. A 'thimble' with a soft point on the tip. This form factor would provide a more natural mechanism for using smaller touch screens.

Now I realise that this would be a gimmick only. There are obvious issues with how to store on or in the device for easy access. Also the variation in finger size and the complications imposed by multi-touch. Still a flexible, elastic fingertip with a small point on the end would be an interesting variation on a theme.
This post is just vague rambling. If anyone is reading this and finds the idea intriguing, feel free to use it. I can't imagine that I would bother doing so my self.