Back when news of the Lumia 950 and Lumia 950 XL was leaking in late summer reports of the phone coming in a Windows Blue color were circulating. We quickly squashed those rumors noting the blue color was only for the prototype, and instead the phone would be offered only in black or white. That came to be the case although third party manufacturers can indeed fill the gaps.
Now, a seller on AliExpress is offering replacement battery covers for the Lumia 950 and Lumia 950 XL and besides black or white you can also grab them in bright orange or that Windows blue color.
Source: ANDRIOD CENTRAL