Hmmmm.... This feature? Too bad I can't find some screenshots or demo on the site.
NEW! Squirrelmail 1.4.5 Skin Features
Brand new matching original icon set.
New tool bar for main plugins with icons.
Easily add extra plugins to the secondary tool bar. (You can also add them to the top bar with an extra icon.)
Notes added to the plugin icons for note keeping features.
To do reminders added to the left bar for quick reference.
To do reminders show on login if user selected.
Welcome user plugin added to front page.
Quick Options selecting on left panel
Added Refresh button on left panel
Easily change the logo for your company.
Easily add your company slogan
Brand New login and sign out pages for each skin set.
Easily switch between skins and color themes through the display options.
Multilingual skins and buttons. With just a few clicks you can change to any language.
Many more useful plugins have been been added saving you time and money.
A brand new WYSIWYG HTML editor has been added to the compose email. One that actually works well with all browsers. Now you can add smilies, pictures, change fonts and much more.