There is a new Windows Phone 8.1 app in the Windows Phone Store that lets you take this customization one step further. Start Screen Customizer provides you with the ability to choose a solid colored background or adjust the tones of a background image to give your Start Screen a little more pop.
Start Screen Customizer's interface is simple with options to create a background image from a solid color or accent an image in your Windows Phone Pictures Hub. The solid color option presents you with a color palette where you can pick a custom color. Additionally you have controls to switch from the color picker or a hex/rgb codes.
The accent image option allows you to choose an image from your Windows Phone Pictures Hub and adjust the red, green and blue tones.
Whichever option you choose, once you have your background image (or color) set just right you can save the image to the Saved Pictures album of your Pictures Hub. Once saved you can go through the normal steps to set the image as your Start Screen background.
Start Screen Customizer is a great option to set a solid color for your background image that will essentially add a custom accent color to many of your Live Tiles. In just tinkering with the app for a short time, it comes across as a simple and quick way to fine-tune your Windows Phone 8.1 Start Screen background images.
Start Screen Customizer is a free app and is only available for Windows Phone 8.1 devices. You can find Start Screen Customizer here in the Windows Phone Store.
Thanks, Marko, for the tip!