In Europe and America, orange is commonly associated with amusement, the unconventional, extroverts, fire, activity, danger, taste and aroma, the autumn season, and Protestantism. In Asia, it is an important symbolic colour of Buddhism and Hinduism.

Satoshi was fond of the word "Karma" in his pennings, ergo the color orange becomes an even better fit. I wonder if bitorange.com is available.