Having a picture version of a note that could be attached to a wall decoration or note pole, or simply used like a note would be awesome. Having a regular note attached to a wall decoration would be cool for certificates, word art and poetry.
Hmmm, with picture notes, even more interesting player-organized treasure hunts could be designed: Find the vendor in this picture to go to the next clue... The next clue is hidden behind the tree in this picture... Leave a note on the third floor of the tower in this picture, and I'll send you a prize.