Pixel 4 comes with a new "Styles and Wallpaper" app that lets you change icons, accent colors and more. But if you use a first gen Pixel, Pixel 2 or Pixel 3, you will not get this feature. On the bright side, there is still a way to use it.
Your circular home screen icons can be changed to rounded squares, circles, and even a teardrop shape. The accent color used in areas such as the quick setting panel can be changed to one of seven different colors except standard blue. In addition, you can even change system fonts! Check out how it's done below.
First, you must unlock the Developer Options menu, which is where your Pixel's hidden theme settings are located.
Open the Settings app, then scroll down and select "About Phone". Scroll down to the bottom of the next page and tap the entry "Building Number" seven times in a row. Enter your PIN for the lock screen when prompted to see a toast message saying "Congratulations! You are now a developer."
Step 2: Theme your device
Now go to the Settings app and press "System," then select "Advanced" and finally "Developer Options." Scroll down to the bottom of this menu and find the section Theming – that's where the fun stuff is.
First, you can press "Accent Color" to change what they are most would refer to as the unit's "theme". This takes the blue color in menus such as Settings and Quick Settings and replaces it with one of seven other options: Cinnamon, Black, Green, Sea, Space, Orchid and Purple.
Now, if you tap "Headline / Body Font", you can you change the font used in all system menus. There is only one option apart from the standard (Noto Serif / Source Sans Pro), but it is definitely a different look.
Finally, there is "Icon Shape." The default value is circle, but you can change it to square, teardrop, circle, or rounded rectangle. The last one is the most similar to the Apple and Samsung icons, if you use it.
Once you've removed all your elements, your Pixel will almost feels like a new device! The quick settings menu will use your icon shape and color, icons on the home screen, the sharing menu and the multitasking user interface will also change shapes, and small accents like the drag handle in your app drawer will use your custom color.