You're in luck, Jen! I found the screen shots of "Carla" from the summer of 2005, and here "she" is!! (Of course, these are old Palm OS images and very primitive graphics by today's standards!) The reason that this kind of pet is called a mutant is that all of the body parts are supposed to "match" each other, but occasionally the game puts together totally random body parts, creating a mutant.

P.S. If you open the image in another browser tab, you'll be able to see it in its original size, for full appreciation of Carla's attributes!