Just a quick tip, if you don't want to use an official iPhone 7 skin for some reason, it's still possible to make your own by buying a cheap iPad screen protector and then cutting out the shape you need.
I should probably first mention that this won't have anywhere near the same quality as a properly manufactured protective skin and doesn't wrap around the edges of the phone, only the flat back surface. But if you want to have a protective layer on the back of your phone, yet can't get access to an official wrap, this is a quick and cheap workaround.
This is the DIY skin I made. I first used a glass iPhone 6 screen protector as a stencil, traced around its edges onto the £1 iPad screen protector and then cut out the general rounded rectangle shape with a swivel blade and metal ruler (don't forget a cutting mat!). The camera and flash slots were then cut out with scissors. It gives a matte black iPhone 7 a near jet black finish and provides basic scratch protection, however it won't protect the curved edges. This current version might have air gaps on the edges, but if you cut closer to the edge of the stencil you can eliminate these.
The reason I made this was because in the past I noticed that some clear iPhone cases actually caused small scratches to the flat surface of the iPhone itself, so this is a quick and dirty workaround.
I should probably first mention that this won't have anywhere near the same quality as a properly manufactured protective skin and doesn't wrap around the edges of the phone, only the flat back surface. But if you want to have a protective layer on the back of your phone, yet can't get access to an official wrap, this is a quick and cheap workaround.
The reason I made this was because in the past I noticed that some clear iPhone cases actually caused small scratches to the flat surface of the iPhone itself, so this is a quick and dirty workaround.