Look for "natural" colors of dark grey, olive, and brown for your Axolotl. Those colors of wild Axolotl have developed over thousands of years for survival, as have other traits of the tiny creature. If you opt for an axolotl that has been genetically mutated to create a "prettier" color, there is the chance that it will be more sickly and come with a host of other problems. of course, you plushie axolotls won't have this problem, so they can be every color of the rainbow!