As well as those two finishes, there's also the Lava Red model which has a more traditional smooth metal finish in a bright red colour. (pocket-lint.com)
For personalization, there are blue and red models available too so you can pick the kids favorite color or even buy multiples and race them together. (mombible.com)
This might not be as noticeable with the white or red models as with the black. (the-ebook-reader.com)