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 background). I thought maybe to invert the colors of an opened Dash with a closed one, but that the end I do not care if the colors do change when I open the Dash, so long as the darker richer version stays.

Is it possible to do this, to make the background stay with a darker color like shown in the pictures above?