I haven’t messed around with themes too much yet, but I can show you how to find and install themes. I would definitely recommend you change your default Ubuntu fonts as well. So lets begin.
Where To Find Ubuntu ThemesThere are a number of websites which have free Ubuntu themes for download. One of those sites that I really enjoy and get most of my themes from is Gnome-Look.org. Gnome-Look offers tons of free themes, wallpapers and icons for download. I am assuming you are using gnome as your window manager. If you are, then browse under the GTK 2 themes. Choose a theme and then we will install it below.
Quick note: If you are using apps developed with the QT library (generally KDE apps) then your GTK theme will not be applied to them. You will have to try find a matching QT theme for your theming to be consistent. A nice website for KDE themes is the sister site of Gnome-Look called KDE-Look.
Installing The ThemeNow that you have the theme downloaded, we need to install it. This is a very simple process:
Firstly, goto system > preferences > appearance
Then, click install…
Now, browse for your theme (It should be a tar.gz file), click open and then click apply new theme.
And thats all there is to it. Go crazy and install as many as you want until you have the perfect theme ......