I like the default theme of Ubuntu, but I like another theme better;
Clearlooks,with Clearlooks-gperfection2 controls and Gartoon icons.
To set this up you need :
sudo apt-get install gnome-themes-extras gnome-icon-theme-gartoon
Go to: system – Preferences – Appearance,
Select Clearlooks and click the customize.. Button (at the bottom),
Select Clearlooks-gperfection2 (my preferred look, choose anything you might like)
Select Icons button (on top) and choose Gartoon (or any other iconset you like of course)
And man o man why does theming crash so often in Gutsy! or is it just me ?