Pimp.my.Gmail series!
If you prefer a script, check out : http://userscripts.org/scripts/show/75047

First things first, this style is inspired & built upon the Gmail: tango! icon theme style by "smaug@userstyles"

This style will Pimp up the Gmail Appbar, which is nothing but the navigation bar which hosts links to other services of Google.
The icons in this style are all 16px. Some are taken from google sites, some from tango icon packages, while the rest are from the style mentioned above.
So credits to the authors of those packages.

Find the rest of the Pimp.my.Gmail series @ "kilroy_@userstyles"
Also check out some of other Gmail scripts @ http://userscripts.org/scripts

CHANGELOG:
v0.4 : 08-05-2010
- Replaced ugly drop-down icon for more menu.
- Fixed issue where icons wouldn't show on different google tlds(top level domains).
- Fully compatible with Opera.
v0.3 : 23-04-2010
- Merged Appbar & Userbar into a single style
- Navbar now floats at the