If you like to have more customization options on the display of your Ubuntu, MyUnity will be one of you favourite application.

Browse the following link to install MyUnity.

apt://myunity

With MyUnity, you can customize the launcher which is located on the left hand side. You can even configure the settings of the Dash Home as well as the fonts.

Here are some screenshots.

Done =)

Reference: Top things to do after installing Ubuntu 12.04 LTS Precise Pangolin