Install Gstyle Gnome Theme Manager On Ubuntu 10.10 “Maverick Meerkat”
Gstyle is an application that allows you to manage and customize all the aspects of Ubuntu from GRUB to the desktop. Gstyle can manage and install gtk themes, icons, wallpapers, window decoration and your GDM (and more!!).
All themes downloaded from gnome-look and deviantart can be installed with a few clicks. Gstyle itself provides full-pack themes downloading. To install Gstyle open a Terminal window (Applications -> Accessories -> Terminal) and copy+paste the following lines:
sudo apt-add-repository ppa:s-lagui
sudo apt-get update
sudo apt-get install gstyle
When installed you can find Gstyle under System -> Preferences -> Gstyle.