Start Screen Color Tuner for Windows 8.1 is the application to solve the following issue:
Windows 8.1 has changed the color settings for the logon screen, so old tweaks and apps don't work any more. Instead of the color index, it stores now some coded color value. I decided to create the app with attractive and simple UI to change the color of logon screen with one click.
As a bonus, it allows you to play with the Start Screen color and Accent color on the fly from the same window.Start Screen Color Tuner is freeware and portable app which supports Windows 8.1 x64 and Windows 8.1 x86. It does not require to be installed or uninstalled.