What are the different colors on the unity launcher icons?

Example:

My question is simple. What are the different colors representing in the unity launcher background for each icon. I mean, it seems consistent (firefox is always orange), but it's not jumping out at me what the pattern is. On my screen, it's:

• Firefox: Orange
• Chrome: Yellow
• Terminal: Grey
• RDP App: Blue
• KeyPassX: Green
• NetBeans: Blue

I'd like to turn it off if possible, but first I'd like to understand more about it.

Any launcher experts?

You can turn off the backlight by firing up compizconfg-settings-manager and turning off the backlight or toggling it:

More information here:

• How can I configure Unity?

Those are just the colors that are supposed to be representing the application and they are extracted for the app's icon using some algorythm.

You can turn it off in the Unity plugin configuration on compizconfig-settings-manager