We've recently released the Beta theme, a quick subtheme experiment with Omega that allowed us to investigate some of the changes to the color module in Drupal 7, and several CSS3 enhancements.
The theme is still quite bare with only two "decent" color schemes, the default blue scheme, and a colorless, gray scale version. In this issue We are in search of more attractive color schemes to package with the Beta theme for the community.
Give it a test run, there's still lots of minor touch ups to work on, including some of the color module preview window, but so far it's looking great, and we're already using it while developing one large commerce site without having any issues related to CSS.
This theme has really gone a long way to further our ability in the future to build beautiful themes with color module support built in. Expect to see a lot more of this type of theme in the upcoming months released for the community.
Enjoy, and be sure to give feedback and requests in the issue queue for the Beta theme.