Check Out the Theme Store
Recent Samsung devices have an awesome thing called a Theme Store. It allows owners to change the entire look and feel of their phone in a matter of minutes. Icons change looks and colors, backgrounds, and everything. It completely makes the phone feel like an entirely different device.
In settings select Personal > Themes and browse the theme store. There is a little something for everyone here, including "stock Android" themes to make the Galaxy S7 seem like a Nexus device. I'm using a Material Design theme, so it looks like stock Android just like Google makes it instead of all Samsung's changes.
This guide goes into more details regarding stock Android themes and customization, and that's just the tip of the iceberg in terms of what the Theme store has to offer owners.