In Windows 8.1 you now have the option of making the Start Screen use your Desktop wallpaper as a background. Here is how to enable it.
How to Make The Start Screen Share Your Desktop Wallpaper on Windows 8.1
Right click on the taskbar and click on Properties when the context menu appears.
Next you will need to switch over to the Navigation pane of the Taskbar and Navigation properties dialog.
Here you are going to want to check the “Show my desktop background on Start” setting.
That’s all there is to it.