Ubuntu's goal to to present the user with a welcoming desktop environment. Although the current theme is a step in that direction, the bright colors and overly bright theme. Warmth aims to be a softer, more blended theme, while still remaining within the ubuntu color scheme.
Warmth uses a blend of light and dark colors to draw the eye to the content of applications. The toolbars and menubars are dark, while the body of the application is light. Also, the lower contrast on the toolbars and menubars make the text and buttons feel blended into the theme, not glaring. Instead of a shiny, glassy effect, which gives a connotation of fragility, Warmth uses gradients, making the theme look more solid and smooth. Finally, Warmth tries to use bright colors in moderation, thus achieving a dimmed look, making the theme less obtrusive.
Warmth's colors are (almost) fully customizable using System > Preferences > Appearance. That is, you can customize any color except the background color of the dark parts and the color of the metacity buttons.
The metacity theme that comes bundled with Warmth is a customized version of the popular Homosapien theme.
Warmth supports Ubuntu Netbook Edition as well, and themes the panel buttons to fit in with the theme.
Full size A screenshot of the Warmth Desktop.
Please comment with suggestions for improvement, etc.