Gunity is a nice and easy to use tool to make some changes to Unity. You can make changes to the unity shell, the grab handles (if enabled) and your desktop.
You can download Gunity here. When download extract the content of the tar.bz2 file and open the gunity folder and double click on the gunity.sh file and click on the Run in Terminal or the Run button.
Things you can change:
Unity Shell Tab:
Launch Animation
Hide Animation
Urgent Animation
Hide Launcher
Launcher icon size
Backlight Mode
Dash Blur
Reveal Mode
Panel Opacity
Key to show the launcher
Grab Handles tab:
Fade Duration
Hide the handles
Show the handles
Toggle Handles
Desktop tab:
Number of Desktop Columns
Number of Desktop Rows