It was mainly the Metacity theme who has been redesigned, as you can see in the screenshot below:
Ubuntu Lucid (10.04) Light Themes (Radiance and Ambiance) - click me if you haven't seen the themes yet - will probably be updated lots of times until Lucid Lynx is released.
This is an update on the New Ubuntu Theme(s), Boot Splash, Logo Revealed (And More!) post which I'm sure will make many people happy.
Dustin Kirkland, a Core Developer of the Ubuntu Server for Canonical posted some screenshots with Byobu and the new Ubuntu Light and Dark themes.
Like we told you a while back (well, actually Mark told you), Ubuntu 10.04 will get a new theme:
Firstly, I'm sure you can't wait to see the new Ubuntu theme. Ubuntu is Lightware:
Some of the best Gnome themes: New Wave, Dust and Dust Sand have just been updated to the latest version in Ubuntu Lucid.
You probably already know these themes very well and there aren't too many visual changes but here are some screenshots anyway.
Here are the fist (probably the first ever) 5 Gnome Shell Themes (download link at the end of the post):
Marine Gnome Shell Theme:
If you're not new to Web Upd8, I'm sure you already know the beautiful Gnome themes from the Bisigi Project which come with an Ubuntu PPA for a one-command installation. Well, today a new theme has been released, called AirLines.
Gstyle is a new full Gnome theme manager with some really great features which I am sure you will love if you like to customize your Desktop look constantly. [...] Gstyle can show you how a theme (any kind of theme: icons, Emerald, Metacity, etc.) actually looks, not just a preview. You will see what I mean in the screenshots below.
Finestly Ying and Yang are 2 new proposed Ubuntu Lucid themes. Ying is a very dark theme and Yang - a very bright one, both using the Murrine engine and adjusted for the Humanity icons:
The first 3 XSplash themes (screens) are part of the Fusion-GX-v00 pack and can be downloaded from the same location - download link after the third XSplash.
Ubuntu Sun is a new proposed theme for Ubuntu Lucid Lynx for which, up until now there was only an unofficial version available for download which is now called Ubuntu Sun X.
[...] DockbarX is a taskbar with grouping and group manipulation for Linux.
After we've seen a Chrome-like theme for Gnome, now it's time for a Wave GTK theme which is inspired by the new Google Wave interface and comes with two metacity themes: default and rounded.
Based on the Ubuntu Sun concept and New Wave, Narfss has created a Gnome theme for which the titlebar (Metacity only) changes automatically depending on the time of day (dawn, noon, evening and night).
GtkPerf is an application designed to test GTK+ performance. The point is to create common testing platform to run predefined GTK+ widgets (opening comboboxes, toggling buttons, scrolling text etc.) and this way define the speed of device/platform.
Perfection Window Decoration:

Fedora 11:

LaGaDesk-BlueNight-II:
1. HumanGraphite

2. BlackBird

3. Karmic X