Re: Customizing ubuntu
Unity Tweak Tool would be my pick for the latest versions of Ubuntu, as it has a number of features that are handled by other apps, but without some things that don't apply to Unity.
The top menu bar isn't set to change colour, though you can change the transparency of it so that the wallpaper shines through. The Unity launcher (left panel) and dash (Super key) should follow suit.
Currently running: elementary Freya. Have experience in Ubuntu up to 14.04. (Started in 8.04)
Student. Reader. Writer. Theatre-goer. I poke around in Linux from time to time, too.
2.16Ghz Quad Core, 4GB RAM, 500GB HDD.