Its a mystery to me how to create my own generator, however the Kaywa QR-generator works fine for simple urls. It would be possible using this generator to create a scavenger hunt game simply using urls to specific flikr account images that contain visual clues and pointers to a next step.
The next step for real is another story.
The next step is a scavenger hunt linking water and information, or at least determining where the links need to be made.
