Product Idea

Background:
There is a golden ratio that is used which, without getting into specifics, we will say 'magically' makes things look good. Whether used in photography, painting, architecture, humans, flowers, and nature in general. it's really a fascinating thing. Here is the wikipedia link for those interested in knowing more: http://en.wikipedia.org/wiki/Golden_ratio.

The Idea:
Print and sell (cheaply) clear plastic overlays with the golden ratio spiral on them. For use on digital cameras and mobile phones. The plastic should be easy to stick on/off and not hurt the screen. if the sticky side wears out, there may be several plastic sheets in a pack.(also several sizes for large/small screens)
The spiral: http://en.wikipedia.org/wiki/File:Fibonacci_spiral_34.svg
The average person would use this to help line up camera angles which will follow the golden ratio resulting in a  much better picture than straight forward photos.
examples: http://jakegarn.com/the-rule-of-thirds/

Bonus:
Although there is software for computers, an overlay sized for PC screens can also be used, allowing the user to line up the photo behind the overlay instead of using 'extra' software to edit their pictures.

negative: some day camera manufacturers might add this overlay as a camera feature and have the overlay right on the camera display. but they have not done this yet, and it always take them ages to implement things well.  This idea is simple, cheap, works for everyone.