Well u know me i had to try and customize the otherwise stubborn unity environment!!
I came across this wonderful little app called Drawers that i used a lot to modify the launcher:[link]
The 3 icons in the middle of the launcher are 2 drawers and the work-space switcher
I also use the drawers to create separators.All u have to do is to make new drawers and change their icon to this invisible .png:[link]
Also in order to get rid of the icon backgrounds in the launcher u have to go to ˝file system/usr/share/unity˝ and replace the existing png files with the invisible icon