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

This style will pimp up the 'Compose mail' page of Gmail.
Features:
+ Replace the Rich-text icons with icons from the gperfection2 iconset by lokheed.
+ Replace the attach file & event invitation icons.
+ Styling for the text-box areas for nicer look.

http://userstyles.org/style_screenshots/31181_after.png for a bigger picture...

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

Changelog:
v0.2 - 23-07-2010
- Fixed a minor bug with rich-text toolbar.
v0.1 - 29-05-2010
- Initial release.