synaesthesia - There's a contest in here somewhere
An interesting condition but this guy actually mapped out his city based on it.
Amazing, and I'm sure there's a monthly challenge in the concept somewhere:
BBC News - The man who can taste the Tube map
“When it’s over and you look in the mirror, did you do the best that you were capable of? If so, the score does not matter. But if you find that you did your best you were capable of, you will find it to your liking.” -John Wooden
* My Finished Maps
* My Challenge Maps
* My deviantArt
I've already heard of that condition but never with taste.