The Samsung Galaxy A7 (2017) is available in four different color options, including Black Sky, Gold Sand, Blue Mist and Peach Cloud. It's nice to have a large selection of colors to choose from. By the way, all of the newly announced 2017 version of the A3, A5 and the A7 - all are available in the same four colors variations.
Here is an image showcasing the four different color options and how they looks for the A7 (2017) from the back side.
As you can see, the Blue Mist is an extremely light blue color, which looks more close to glacier blue or white than a strong blue color. I really like the user of subtle color for smartphone. I personally would have picked up the blue version because it looks like the most unique one of the four but all of them look really nice.
Oh, I almost forgot to mention that the color of the back also covers the front and the sides as well Some phones have a colorful back but the front is black, so just so you know that this color covers the entire surface of the phone, except the screen part obviously.