There's a DIY kit you can buy that will give your iPhone 7 a glowing Apple logo on the back, and it looks amazing with the black iPhone 7.
It looks like a modern take on the $1,900 Retro iPhone 7 from Colorware, which has an old-school design complete with the original rainbow-colored Apple logo, but this lighting kit costs a fraction of the price.
One important note before buying: David Cogen from TheUnlockr does warn that going through with the procedure will void your warranty, so don't expect Apple to repair your iPhone 7 if you break it. He also mentioned that it removes the iPhone 7's water resistance, but it'll still survive the occasional splash like most phones.
What effect does it have on battery life? Cogen told me that he left the customized iPhone 7 on for a few days without much effect on battery life, and that it died at "the same time it always did," but results may vary.