Andy and Tom of the Cinnamon Hill Folk Art have created some neat doorbells that double as "wall art."
Check out their fantastic creations like the wine bottle bell (left), pipe organ doorbell, and a strange contraption called the zimbelstern.
Link - Thanks Ralph Geiger!
And of course, you need a "unique" doorbell ringer to match: Link
http://www.greenergrassdesign.com/doorbellbottomsupbypetervanderjagt.html