I believe that a good deal of the art and creativity that goes into the folding of an origami design is the paper choice.
I tend to go for, if not natural, at least colors that people expect of a particular object, for a very simple reason. A few years ago, my sister and I had a Christmas tree, and I decorated it with origami, including Toshie's Rose Brooch (Sy Chen's).
I used normal kami, or that is to say, origami paper that was in plain colors (blue, orange, etc.) on one side and white on the other, and my sister took them for "fancy stars."
After that, I started folding them from papers that were colors that people would expect of roses, or else gold and silver, and they were then always instantly recognized for roses.
This same principle applies to so much of what I fold. But, I think that polka dotted elephants are still on the same principle: it conveys a message. Just as if I wanted to convey rosiness by using red or pink paper, a polke dotted paper, used for an elephant, might convey whimsy in a way that could never be conveyed with grey paper.
I've personally folded both white and pink elephants over the past week.
