OS: Linux Mint 12
Estimated Completion Time: 1 Minute
Download your favorite gnome shell theme.
example theme:Gnome Shell – Ice Crean Sandwich Download link
1.Open Advanced settings. To open advanced settings, click Menu button and select Advanced settings or type Advanced settings in the search field and select Advanced settings.
2.Then select theme option and click Shell theme None button.
3.Browse and select your theme and click open.
4.After the successful installation of your themes, select it from Shell Theme Menu. If the changes doesn’t appear instantly then hit Alt+F2 and type r (and press Enter to reload the shell theme).