Solid, goes to show the power of the jQuery UI theming framework. This uses even less images and more CSS3 than the last CSS3 implementation of Aristo, which wasn't built for jQuery UI:

http://dtrejo.github.com/aristo/

Specifically, this one uses inner shadows to generate things like the slider bars without background-image, and most everything else is CSS3 gradients.

The blog post calls jQuery UI's default themes goofy--I won't contest they look dated, but you can get from there to near-Aristo quality by 1) decreasing the border-radius in ThemeRoller to 3px or 2px 2) only using handsome gradient backgrounds and 3) adding some more CSS rules to just add some inner glow, box-shadow and text-shadow on the better browsers. In fact, ThemeRoller could be fairly easily updated to support such things from within the graphical designer.

For example, this app editor interface is pretty much all vanilla jQuery UI, with only the slightest of enhancements in a separate file so themes could potentially be swapped out underneath:

http://quickfuseapps.com/app/edit