It's a good idea to customize your Apple iPhone 7 Plus background with something unique. Such as this picture of color pencils which captured in close up. If you want to choose a picture for iPhone 7 Plus background, you should choose a picture with specific resolution. You will need a picture with more than 1080 pixels width and 1920 pixels height. If you have a picture with large size, the picture will be cropped into 1080x1920 pixels. But if you want to use this picture, you will not need to convert.
Furthermore, you can also use my another wallpaper collection with similar resolution on this site. If you want to get more, you can also visit our gallery below:
Wallpapers with 1080x1920 for iPhone 7 Plus
Apple iPhone 7 Plus Background with Color Pencils