How to customize Unity Launcher's background

view story

http://askubuntu.com – In this question I do not want to customize the launcher for each workspace, or change the animations or behaviors of the icons. I only want to change how the background of the Launcher looks. Let me show you what I mean: If I do not open the Dash, the launcher looks like the following: It looks like this because I have a background that has gray, black and white colors. So Unity tries to accommodate the launcher to contrast with it. Now when I open the Dash, the launcher looks like this: What I want is to make the launcher look the same as if my Dash were open (Darker, richer backgrou (HowTos)