Set Background Color for Windows Phone 8
Step 1: Access the app list in Windows Phone 8, then select Settings (Image below)
Step 2: Choose Theme (Image below)
Step 3: Navigate to Background (Image below)
With the default Windows Phone 8 theme, there are two color options: dark and light.
Here you can select the background color according to your preference, and after selecting, you'll notice the difference.
Customize Functional Tile Colors on Windows Phone 8.
Step 1: Navigate to: Settings > Theme
Then tap on Accent Color to set colors for the functional tiles (Image below).
Step 2: Here, you'll be able to choose from a variety of colors.
After selecting your desired color, you'll notice the difference.
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So with the guidance above, you can quickly customize the interface colors of Windows Phone 8 as well as the colors of functional tiles, making your operating system more vibrant and colorful.
Wishing you success!