I haven't covered OS X graphical mods here on MacStories for a long time, but this one's good. It didn't take long: if you hate iTunes 10's new UI or you simply want the old colorful iTunes back, give a try to Damien Erambert's iTunes 109.
The download comes with an easy to setup installer package which lets you choose if you want to change the entire application UI or just the sidebar icons. You can also get rid of those odd vertical buttons and change the application icon. I applied the mod on my new iMac, and it worked perfectly. Take a look at the screenshots below, and go download the mod here.