How to change the Dash icon in the Unity Launcher?

I don't like the Dash icon in the Unity Launcher, it's pretty inconsistent with the Faenza icon theme and I would like to change it. How can I do that?

Here is a screenshot of the icon:
http://ubuntuone.com/4nhexmXiLmaQCnDyIFS27x

I have asked the same question on http://askubuntu.com/ and the only answer I got was:

"To my knowledge this icon is hard coded and cannot be changed (I could be wrong but I have not seen it change for any other theme)."

Is that true? I have saw a screenshot of Unity 2D and the icon is different: http://ubuntuone.com/3zQ0P9xN2YkDPHpbsyr79w.
Is it possible to have that icon in Unity 3D?