Ubuntu is the most customizable Operating System out. There are a number of websites that dedicate themselves to serving you many different flavours of themes for your Ubuntu. You can make Ubuntu look and feel like Mac or Windows if you please. Your friends wont even be able to tell the difference.
There is such a variety to choose from. Below is a list of sites that you can find themes that would suite your taste the best. There is no limit really to how far you can customize your Ubuntu look and feel.
Please note: Ubuntu uses the Gnome Graphics User Interface (GTK).
INSTALLING A THEME IN UBUNTU:
THE PIECES THAT MAKE UP A THEME:
