Ubuntu - resizing icons/ Ubuntu - micsorare icons

Ok, the simplest way to resize an icon on Ubuntu with Gnome desktop, is right clicking it and using Strech Icon and then simply moving your mouse like you do on a normal desktop window. This is the quickest way (the second way isn't hard at all :P), but it only applies to one icon, the one you resize it.
The second way: open terminal and write nautilus, the go Edit->Preferences and there you can see Icon View Defaults, simply choose a smaller size. The best way visually in my opinion is 75%, but it's up to you now. Now all your icons are smaller :)
Good luck