The wild type axolotls tend to be a grey dark greyish green with black and olive mottling.  They can have speckles of gold (iridophores) and a pale colored belly.  These specimens are special because they have the same pattern and colors as those found in the wild. 

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The wild type is the oldest axolotl type known in the pet trade.  Depending on the specimen, they can be mostly black, grey, or even a lighter yellow green.  This morph tends to have purple or maroon gill filaments.  They eyes are dark with golden irises. 

 

This morph is great for those wanting a more naturualistic tank.  They are so cute and remind me of little green aliens or monsters!