You want 'avant-window-navigator' from the package manager of your choice. It is like Marmite you either love it or hate it, I love it but then I love Marmite too
. I found it easy to use yes and loads of people use it. It makes your desktop look a bit like a Mac. Version 0.3.3 is better than 0.2.6 but you may have to add a different repo for that, not too sure, I compiled my version of 0.3.3 from source before it became available through the package manager.
Give it a go it is easily removed if you don't like it.
It looks something like this:
I have the simple glass theme enabled which is a seperate download but looks better than the default black bar. Easily loaded with the theme manager which is part of the dock preferences (just right click on one of the icons to open the preferences menu).
NB Just in case you don't know the curving 'tree' of folders is how it displays folders when you click on an icon, they are not like that all the time, but it looks kinda neat so I thought I would display it in the image.
Fujitsu Lifebook AH532 Laptop. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Ubuntu12.10 (Unity), Mint14 (Cinnamon), Manjaro (Xfce).