as a wise band once (nearly) sang, there is nothing better in life that writing on a banana with a biro. there really isn't and i highly recommend you try it
i was very pleased with this photo which shows several piles of fruit mimicking the city of london in the background.
there two other versions here and here.
i saw these two bananas with two of their banana friends dancing by in the street near my office. here they are considering a massage back rub. a dangerous option for a banana i imagine