I just listened to a serotek podcast about accessorizing a cane or guide dog. Some people like to do this, and others think it is unprofessional.
I am one who likes to decorate. I have a purple harness for my guide dog; it is nylon. Not only is it padded and much lighter than the traditional leather harness, but is a nice color. I also have a dolphin-shaped collar bell. All of my dogs are good at moving silently, especially when they are doing something they aren’t supposed to. The bell helps me keep better track of my dog. She does not wear this when we go out because the noise bothers me, and I do not want to attract attention from neighborhood dogs.
I also like to put something on my cane. The cane is an extention of my body. When I went to the prom, I decorated it with bands of rhinestones. At blind inc., I had a guide dog charm on it; since everyone had one, it made it easy to tell which was mine. Now, I have a holly leaf-shaped charm for Christmas.