I use this animated water drop screen effect as the screensaver for iPhone 7. I believe that this screensaver will be a cool lockscreen for your iPhone. The picture also configured in 750x1334 pixels, which also the same with iPhone 7's official resolution.
Screensaver or lockscreen is a display when the phone in locked mode. By using an unique screensaver, you can make your phone looks different. Furthermore, this lockscreen picture is the #7 of all screensavers for iPhone 7. Below gallery shows you another cool lockscreens that you can download for free: