This might be an old one you’ve seen before but I found it intriguing, if not least to entertain the notion of a Lumia with iOS.
Here’s a Nokia Lumia 920 with what looks to be an old version of iOS. Note how the windows button is carefully hidden away there. It looks like the cyan one as comments suggested and then magically turns white but it might just be the white balance making the white look a cooler hue.
It’s certainly one way to get around the lack of apps issue whilst still not giving in to Android eh?