Well as a part of my new installation I don’t like when it looks like every other install so I was looking for themes, althougt it’s a simple thing doesn’t hurt to remeber how to do it.
First go to www.gnome-look.org and look under the GTK 3.0 category for a theme that looks good for you and download it.
After it downloads just go to your downloads folder and extract it.
tar -zxvf [THEME_DOWNLOADED_NAME]
After that just move the extracted folder to /usr/share/themes/ to make it available to all users, remember to do it as sudo
sudo mv [THEME_EXTRACTED_NAME] /usr/share/themes/
Now just open the “Unity Tweak Tool” and click theme to select it if you don’t have it installed run:
sudo apt-get install unity-tweak-tool
And that changes almost everything but the background image just change it from the “Settings manager” and that’s all.
Nice ScreenCast to see it “almost” in action. Install Themes on Recent Ubuntu Releases without Crying