But you don't want just any icon pack. What you want is a mix between aesthetic appeal, support for your particular launcher, and as many styled icons as possible. Yeah, you read that right – these packs won't change the appearance of absolutely all app icons, but rather the more popular ones. So the more apps that are covered, the better.
There used to be a way, but the app in question was taken off the Play Store for unknown reasons.Unfortunately, unless you're using a third-party launcher like Nova, Apex, Aviate, ADW, or whatever else has your fancy, you'll need a rooted device to apply an icon pack with most stock launchers.
Anyways, now that we've done away with the disclaimers, let's get ourselves some icon goodness.
* Arranged in no particular order.